Milk

A glass of pasteurized cow's milk

Milk is a pale liquid produced by the mammary glands of mammals. It is the primary source of nutrition for infant mammals before they are able to digest other types of food. Early-lactation milk contains colostrum, which carries the mother's antibodies to its young and can reduce the risk of many diseases. It contains many other nutrients^[1] including protein and lactose.

As an agricultural product, milk is extracted from mammals during or soon after pregnancy. Dairy farms produced about 730 million tonnes of milk in 2011,^[2] from 260 million dairy cows.^[3] India is the world's largest producer of milk, and is the leading exporter of skimmed milk powder, yet has little to no other milk product exports.^[4][5] The ever increasing rise in domestic demand for dairy products and a large demand-supply gap could lead to India being a net importer of dairy products in the future.^[6] New Zealand, the European Union's 28 member states, Australia, and the United States are the world's largest exporters of milk and milk products. China and Russia were the world's largest importers of milk and milk products.^[7][8] Both countries were self-sufficient by 2016 contributing to a worldwide glut of milk.^[9]

Throughout the world, there are more than six billion consumers of milk and milk products. Over 750 million people live within dairy farming households.^[10]

Types of consumption

There are two distinct types of milk consumption: a natural source of nutrition for all infant mammals and a food product for humans of all ages that is derived from other animals.

Nutrition for infant mammals

A human baby feeding on its mother's milk

A goat kid feeding on its mother's milk

In almost all mammals, milk is fed to infants through breastfeeding, either directly or by expressing the milk to be stored and consumed later. The early milk from mammals is called colostrum. Colostrum contains antibodies that provide protection to the newborn baby as well as nutrients and growth factors.^[11] The makeup of the colostrum and the period of secretion varies from species to species.^[12]

For humans, the World Health Organization recommends exclusive breastfeeding for six months and breastfeeding in addition to other food for at least two years.^[13] In some cultures it is common to breastfeed children for three to five years, and the period may be longer.^[14]

Fresh goats' milk is sometimes substituted for breast milk. This introduces the risk of the child developing electrolyte imbalances, metabolic acidosis, megaloblastic anemia, and a host of allergic reactions.^[15]

Food product for humans

Holstein cattle, the dominant breed in industrialized dairying today

In many cultures of the world, especially the West, humans continue to consume milk beyond infancy, using the milk of other animals (especially cattle, goats and sheep) as a food product. Initially, the ability to digest milk was limited to children as adults did not produce lactase, an enzyme necessary for digesting the lactose in milk. Milk was therefore converted to curd, cheese and other products to reduce the levels of lactose. Thousands of years ago, a chance mutation spread in human populations in Europe that enabled the production of lactase in adulthood. This allowed milk to be used as a new source of nutrition which could sustain populations when other food sources failed.^[16] Milk is processed into a variety of dairy products such as cream, butter, yogurt, kefir, ice cream, and cheese. Modern industrial processes use milk to produce casein, whey protein, lactose, condensed milk, powdered milk, and many other food-additives and industrial products.

Whole milk, butter and cream have high levels of saturated fat.^[17][18] The sugar lactose is found only in milk, forsythia flowers, and a few tropical shrubs. The enzyme needed to digest lactose, lactase, reaches its highest levels in the small intestine after birth and then begins a slow decline unless milk is consumed regularly.^[19] Those groups who do continue to tolerate milk, however, often have exercised great creativity in using the milk of domesticated ungulates, not only of cattle, but also sheep, goats, yaks, water buffalo, horses, reindeer and camels. The largest producer and consumer of cattle and buffalo milk in the world is India.^[20]

Per capita consumption of milk and milk products in selected countries in 2011^[21]

Country	Milk (liters)	Cheese (kg)	Butter (kg)
Ireland	135.6	6.7	2.4
Finland	127.0	22.5	4.1
United Kingdom	105.9	10.9	3.0
Australia	105.3	11.7	4.0
Sweden	90.1	19.1	1.7
Canada	78.4	12.3	2.5
United States	75.8	15.1	2.8
Europe	62.8	17.1	3.6
Brazil	55.7	3.6	0.4
France	55.5	26.3	7.5
Italy	54.2	21.8	2.3
Germany	51.8	22.9	5.9
Greece	49.1	23.4	0.7
Netherlands	47.5	19.4	3.3
India	39.5	-	3.5
China	9.1	-	0.1

Terminology

The term milk is also used for white colored, non-animal beverages resembling milk in color and texture (milk substitutes) such as soy milk, rice milk, almond milk, and coconut milk. In addition, a substance secreted by pigeons to feed their young is called "crop milk" and bears some resemblance to mammalian milk, although it is not consumed as a milk substitute.^[22] Dairy relates to milk and milk production, e.g. dairy products. Milk can be synthesized in a laboratory, from water, fatty acids and proteins.^[23][24]

Evolution of lactation

The mammary gland is thought to have derived from apocrine skin glands.^[25] It has been suggested that the original function of lactation (milk production) was keeping eggs moist. Much of the argument is based on monotremes (egg-laying mammals).^[25][26][27] The original adaptive significance of milk secretions may have been nutrition^[28] or immunological protection.^[29][30] This secretion gradually became more copious and accrued nutritional complexity over evolutionary time.^[25]

History

Drinking milk in Germany in 1932

Humans first learned to regularly consume the milk of other mammals following the domestication of animals during the Neolithic Revolution^[31] or the development of agriculture. This development occurred independently in several places around the world from as early as 9000–7000 BC in Southwest Asia^[32] to 3500–3000 BC in the Americas.^[33] The most important dairy animals—cattle, sheep and goats—were first domesticated in Southwest Asia, although domestic cattle had been independently derived from wild aurochs populations several times since.^[34][35] Initially animals were kept for meat, and archaeologist Andrew Sherratt has suggested that dairying, along with the exploitation of domestic animals for hair and labor, began much later in a separate secondary products revolution in the fourth millennium BC.^[36] Sherratt's model is not supported by recent findings, based on the analysis of lipid residue in prehistoric pottery, that shows that dairying was practiced in the early phases of agriculture in Southwest Asia, by at least the seventh millennium BC.^[37][38]

From Southwest Asia domestic dairy animals spread to Europe (beginning around 7000 BC but not reaching Britain and Scandinavia until after 4000 BC),^[39] and South Asia (7000–5500 BC).^[40] The first farmers in central Europe^[41] and Britain^[42] milked their animals. Pastoral and pastoral nomadic economies, which rely predominantly or exclusively on domestic animals and their products rather than crop farming, were developed as European farmers moved into the Pontic-Caspian steppe in the fourth millennium BC, and subsequently spread across much of the Eurasian steppe.^[43] Sheep and goats were introduced to Africa from Southwest Asia, but African cattle may have been independently domesticated around 7000–6000 BC.^[44] Camels, domesticated in central Arabia in the fourth millennium BC, have also been used as dairy animals in North Africa and the Arabian Peninsula.^[45] The earliest Egyptian records of burn treatments describe burn dressings using milk from mothers of male babies.^[46] In the rest of the world (i.e., East and Southeast Asia, the Americas and Australia) milk and dairy products were historically not a large part of the diet, either because they remained populated by hunter-gatherers who did not keep animals or the local agricultural economies did not include domesticated dairy species. Milk consumption became common in these regions comparatively recently, as a consequence of European colonialism and political domination over much of the world in the last 500 years.

In the Middle Ages, milk was called the "virtuous white liquor" because alcoholic beverages were more safe to consume than water.^[47]

Industrialization

Preserved Express Dairies three-axle milk tank wagon at the Didcot Railway Centre, based on an SR chassis

The growth in urban population coupled with the expansion of the railway network in the mid-19th century, brought about a revolution in milk production and supply. Individual railway firms began transporting milk from rural areas to London from the 1840s and 1850s. Possibly the first such instance was in 1846, when St Thomas's Hospital in Southwark contracted with milk suppliers outside London to provide milk by rail.^[48] The Great Western Railway was an early and enthusiastic adopter, and began to transport milk into London from Maidenhead in 1860, despite much criticism. By 1900, the company was transporting over 25 million gallons annually.^[49] The milk trade grew slowly through the 1860s, but went through a period of extensive, structural change in the 1870s and 1880s.

Milk transportation in Salem, Tamil Nadu

Urban demand began to grow, as consumer purchasing power increased and milk became regarded as a required daily commodity. Over the last three decades of the 19th century, demand for milk in most parts of the country doubled, or in some cases, tripled. Legislation in 1875 made the adulteration of milk illegal - this combined with a marketing campaign to change the image of milk. The proportion of rural imports by rail as a percentage of total milk consumption in London grew from under 5% in the 1860s to over 96% by the early 20th century. By that point, the supply system for milk was the most highly organized and integrated of any food product.^[48]

1959 milk supply in Oberlech, Vorarlberg, Austria

The first glass bottle packaging for milk was used in the 1870s. The first company to do so may have been the New York Dairy Company in 1877. The Express Dairy Company in England began glass bottle production in 1880. In 1884, Hervey Thatcher, an American inventor from New York, invented a glass milk bottle, called 'Thatcher's Common Sense Milk Jar', which was sealed with a waxed paper disk.^[50] Later, in 1932, plastic-coated paper milk cartons were introduced commercially.^[50]

In 1863, French chemist and biologist Louis Pasteur invented pasteurization, a method of killing harmful bacteria in beverages and food products.^[50] He developed this method while on summer vacation in Arbois, to remedy the frequent acidity of the local wines.^[51] He found out experimentally that it is sufficient to heat a young wine to only about 50–60 °C (122–140 °F) for a brief time to kill the microbes, and that the wine could be nevertheless properly aged without sacrificing the final quality.^[51] In honor of Pasteur, the process became known as "pasteurization". Pasteurization was originally used as a way of preventing wine and beer from souring.^[52] Commercial pasteurizing equipment was produced in Germany in the 1880s, and the process had been adopted in Copenhagen and Stockholm by 1885.^[53][54]

Overproduction

Continued improvements in the efficiency for the production of milk led to a worldwide glut of milk by 2016. Russia and China became self-sufficient and stopped importing milk. Canada has tried to restrict milk production by forcing new farmers/increased capacity to "buy in" at CN$24,000 per cow. Importing milk is prohibited. The European Union theoretically stopped subsidizing dairy farming in 2015. Direct subsidies were replaced by "environmental incentives" which results in the government buying milk when the price falls to €200 per 1,000 litres (220 imp gal; 260 US gal). The United States has a voluntary insurance program that pays farmers depending upon the price of milk and the cost of feed.^[9]

Sources of milk

Modern dairy farm in Norway

The females of all mammal species can by definition produce milk, but cow's milk dominates commercial production. In 2011, FAO estimates 85% of all milk worldwide was produced from cows.^[55]

Human milk is not produced or distributed industrially or commercially; however, human milk banks collect donated human breastmilk and redistribute it to infants who may benefit from human milk for various reasons (premature neonates, babies with allergies, metabolic diseases, etc.) but who cannot breastfeed.^[56]

In the Western world, cow's milk is produced on an industrial scale and is by far the most commonly consumed form of milk. Commercial dairy farming using automated milking equipment produces the vast majority of milk in developed countries. Dairy cattle such as the Holstein have been bred selectively for increased milk production. About 90% of the dairy cows in the United States and 85% in Great Britain are Holsteins.^[19] Other dairy cows in the United States include Ayrshire, Brown Swiss, Guernsey, Jersey and Milking Shorthorn (Dairy Shorthorn).

Sources aside from cows

Other significant sources of milk

Goats (2% of world's milk)

Buffaloes (11%)

Aside from cattle, many kinds of livestock provide milk used by humans for dairy products. These animals include buffalo, goat, sheep, camel, donkey, horse, reindeer and yak. The first four respectively produced about 11%, 2%, 1.4% and 0.2% of all milk worldwide in 2011.^[55]

In Russia and Sweden, small moose dairies also exist.^[57]

According to the US National Bison Association, American bison (also called American buffalo) are not milked commercially;^[58] however, various sources report cows resulting from cross-breeding bison and domestic cattle are good milk producers, and have been used both during the European settlement of North America^[59] and during the development of commercial Beefalo in the 1970s and 1980s.^[60]

Production worldwide

Top ten cow milk producers in 2013 [61] Rank Country Production (metric tonnes) 1  United States 91,271,058 2  India 60,600,000 3  China 35,310,000 4  Brazil 34,255,236 5  Germany 31,122,000 6  Russia 30,285,969 7  France 23,714,357 8  New Zealand 18,883,000 9  Turkey 16,655,009 10  United Kingdom 13,941,000

Top ten sheep milk producers in 2013 [62] Rank Country Production (metric tonnes) 1  China 1,540,000 2  Turkey 1,101,013 3  Greece 705,000 4  Syria 684,578 5  Romania 632,582 6  Spain 600,568 7  Sudan 540,000 8  Somalia 505,000 9  Iran 470,000 10  Italy 383,837

Top ten goat milk producers in 2013 [63] Rank Country Production (metric tonnes) 1  India 5,000,000 2  Bangladesh 2,616,000 3  Sudan 1,532,000 4  Pakistan 801,000 5  Mali 720,000 6  France 580,694 7  Spain 471,999 8  Turkey 415,743 9  Somalia 400,000 10  Greece 340,000

Top ten buffalo milk producers in 2013 [64] Rank Country Production (metric tonnes) 1  India 70,000,000 2  Pakistan 24,370,000 3  China 3,050,000 4  Egypt 2,614,500 5    Nepal 1,188,433 6  Myanmar 309,000 7  Italy 194,893 8  Sri Lanka 65,000 9  Iran 65,000 10  Turkey 51,947

In 2012, the largest producer of milk and milk products was India followed by the United States of America, China, Pakistan and Brazil.^[65] All 28 European Union members together produced 153.8 million tonnes of milk in 2013, the largest by any politico-economic union.^[66]

Increasing affluence in developing countries, as well as increased promotion of milk and milk products, has led to a rise in milk consumption in developing countries in recent years. In turn, the opportunities presented by these growing markets have attracted investments by multinational dairy firms. Nevertheless, in many countries production remains on a small scale and presents significant opportunities for diversification of income sources by small farms.^[67] Local milk collection centers, where milk is collected and chilled prior to being transferred to urban dairies, are a good example of where farmers have been able to work on a cooperative basis, particularly in countries such as India.^[68]

Production yields

Girl milking a cow by hand

FAO reports^[55] Israel dairy farms are the most productive in the world, with a yield of 12,546 kilograms (27,659 lb) milk per cow per year. This survey over 2001 and 2007 was conducted by ICAR (International Committee for Animal Recording^[69]) across 17 developed countries. The survey found that the average herd size in these developed countries increased from 74 to 99 cows per herd between 2001 to 2007. A dairy farm had an average of 19 cows per herd in Norway, and 337 in New Zealand. Annual milk production in the same period increased from 7,726 to 8,550 kg (17,033 to 18,850 lb) per cow in these developed countries. The lowest average production was in New Zealand at 3,974 kg (8,761 lb) per cow. The milk yield per cow depended on production systems, nutrition of the cows, and only to a minor extent different genetic potential of the animals. What the cow ate made the most impact on the production obtained. New Zealand cows with the lowest yield per year grazed all year, in contrast to Israel with the highest yield where the cows ate in barns with an energy-rich mixed diet.

The milk yield per cow in the United States, the world's largest cow milk producer, was 9,954 kg (21,945 lb) per year in 2010. In contrast, the milk yields per cow in India and China – the second and third largest producers – were respectively 1,154 kg (2,544 lb) and 2,282 kg (5,031 lb) per year.^[70]

Price

It was reported in 2007 that with increased worldwide prosperity and the competition of bio-fuel production for feed stocks, both the demand for and the price of milk had substantially increased worldwide. Particularly notable was the rapid increase of consumption of milk in China and the rise of the price of milk in the United States above the government subsidized price.^[71] In 2010 the Department of Agriculture predicted farmers would receive an average of $1.35 per US gallon of cow's milk (35 cents per liter), which is down 30 cents per gallon from 2007 and below the break-even point for many cattle farmers.^[72]

Grading

In the United States, there are two grades of milk, with grade A primarily used for direct sales and consumption in stores, and grade B used for indirect consumption, such as in cheese making or other processing.

The differences between the two grades are defined in the Wisconsin administrative code for Agriculture, Trade, and Consumer Protection, chapter 60.^[73] Grade B generally refers to milk that is cooled in milk cans, which are immersed in a bath of cold flowing water that typically is drawn up from an underground water well rather than using mechanical refrigeration.

Physical and chemical properties of milk

Milk is an emulsion or colloid of butterfat globules within a water-based fluid that contains dissolved carbohydrates and protein aggregates with minerals.^[74] Because it is produced as a food source for the young, all of its contents provide benefits for growth. The principal requirements are energy (lipids, lactose, and protein), biosynthesis of non-essential amino acids supplied by proteins (essential amino acids and amino groups), essential fatty acids, vitamins and inorganic elements, and water.^[75]

Butterfat is a triglyceride (fat) formed from fatty acids such as myristic, palmitic, and oleic acids.

Lipids

Initially milk fat is secreted in the form of a fat globule surrounded by a membrane.^[76] Each fat globule is composed almost entirely of triacylglycerols and is surrounded by a membrane consisting of complex lipids such as phospholipids, along with proteins. These act as emulsifiers which keep the individual globules from coalescing and protect the contents of these globules from various enzymes in the fluid portion of the milk. Although 97–98% of lipids are triacylglycrols, small amounts of di- and monoacylglycerols, free cholesterol and cholesterol esters, free fatty acids, and phospholipids are also present. Unlike protein and carbohydrates, fat composition in milk varies widely in the composition due to genetic, lactational, and nutritional factor difference between different species.^[76]

Like composition, fat globules vary in size from less than 0.2 to about 15 micrometers in diameter between different species. Diameter may also vary between animals within a species and at different times within a milking of a single animal. In unhomogenized cow's milk, the fat globules have an average diameter of two to four micrometers and with homogenization, average around 0.4 micrometers.^[76] The fat-soluble vitamins A, D, E, and K along with essential fatty acids such as linoleic and linolenic acid are found within the milk fat portion of the milk.^[19]

Proteins

Normal bovine milk contains 30–35 grams of protein per liter of which about 80% is arranged in casein micelles.

Caseins

The largest structures in the fluid portion of the milk are "casein micelles": aggregates of several thousand protein molecules with superficial resemblance to a surfactant micelle, bonded with the help of nanometer-scale particles of calcium phosphate. Each casein micelle is roughly spherical and about a tenth of a micrometer across. There are four different types of casein proteins: αs1-, αs2-, β-, and κ-caseins. Collectively, they make up around 76–86%^[75] of the protein in milk, by weight. Most of the casein proteins are bound into the micelles. There are several competing theories regarding the precise structure of the micelles, but they share one important feature: the outermost layer consists of strands of one type of protein, k-casein, reaching out from the body of the micelle into the surrounding fluid. These kappa-casein molecules all have a negative electrical charge and therefore repel each other, keeping the micelles separated under normal conditions and in a stable colloidal suspension in the water-based surrounding fluid.^[19][77]

Milk contains dozens of other types of proteins beside the caseins including enzymes. These other proteins are more water-soluble than the caseins and do not form larger structures. Because the proteins remain suspended in the whey left behind when the caseins coagulate into curds, they are collectively known as whey proteins. Whey proteins make up approximately 20% of the protein in milk, by weight. Lactoglobulin is the most common whey protein by a large margin.^[19]

Salts, minerals, and vitamins

Minerals or milk salts, are traditional names for a variety of cations and anions within bovine milk. Calcium, phosphate, magnesium, sodium, potassium, citrate, and chlorine are all included as minerals and they typically occur at concentration of 5–40 mM. The milk salts strongly interact with casein, most notably calcium phosphate. It is present in excess and often, much greater excess of solubility of solid calcium phosphate.^[75] In addition to calcium, milk is a good source of many other vitamins. Vitamins A, B6, B12, C, D, K, E, thiamine, niacin, biotin, riboflavin, folates, and pantothenic acid are all present in milk.

Calcium phosphate structure

For many years the most accepted theory of the structure of a micelle was that it was composed of spherical casein aggregates, called submicelles, that were held together by calcium phosphate linkages. However, there are two recent models of the casein micelle that refute the distinct micellular structures within the micelle.

The first theory attributed to de Kruif and Holt, proposes that nanoclusters of calcium phosphate and the phosphopeptide fraction of beta-casein are the centerpiece to micellular structure. Specifically in this view, unstructured proteins organize around the calcium phosphate giving rise to their structure and thus no specific structure is formed.

The second theory proposed by Horne, the growth of calcium phosphate nanoclusters begins the process of micelle formation but is limited by binding phosphopeptide loop regions of the caseins. Once bound, protein-protein interactions are formed and polymerization occurs, in which K-casein is used as an end cap, to form micelles with trapped calcium phosphate nanoclusters.

Some sources indicate that the trapped calcium phosphate is in the form of Ca9(PO4)6; whereas, others say it is similar to the structure of the mineral brushite CaHPO4 -2H2O.^[78]

Carbohydrates and miscellaneous contents

A simplified representation of a lactose molecule being broken down into glucose (2) and galactose (1)

Milk contains several different carbohydrate including lactose, glucose, galactose, and other oligosaccharides. The lactose gives milk its sweet taste and contributes approximately 40% of whole cow's milk's calories. Lactose is a disaccharide composite of two simple sugars, glucose and galactose. Bovine milk averages 4.8% anhydrous lactose, which amounts to about 50% of the total solids of skimmed milk. Levels of lactose are dependent upon the type of milk as other carbohydrates can be present at higher concentrations that lactose in milks.^[75]

Other components found in raw cow's milk are living white blood cells, mammary gland cells, various bacteria, and a large number of active enzymes.^[19]

Appearance

Both the fat globules and the smaller casein micelles, which are just large enough to deflect light, contribute to the opaque white color of milk. The fat globules contain some yellow-orange carotene, enough in some breeds (such as Guernsey and Jersey cattle) to impart a golden or "creamy" hue to a glass of milk. The riboflavin in the whey portion of milk has a greenish color, which sometimes can be discerned in skimmed milk or whey products.^[19] Fat-free skimmed milk has only the casein micelles to scatter light, and they tend to scatter shorter-wavelength blue light more than they do red, giving skimmed milk a bluish tint.^[77]

Processing

Milk products and productions relationships (click for details)

In most Western countries, centralized dairy facilities process milk and products obtained from milk, such as cream, butter, and cheese. In the US, these dairies usually are local companies, while in the Southern Hemisphere facilities may be run by very large nationwide or trans-national corporations such as Fonterra.

Pasteurization

Pasteurization is used to kill harmful microorganisms by heating the milk for a short time and then immediately cooling it. The standard high temperature short time (HTST) process produces a 99.999% reduction in the number of bacteria in milk, rendering it safe to drink for up to three weeks if continually refrigerated. Dairies print expiration dates on each container, after which stores remove any unsold milk from their shelves.

A side effect of the heating of pasteurization is that some vitamin and mineral content is lost. Soluble calcium and phosphorus decrease by 5%, thiamin and vitamin B12 by 10%, and vitamin C by 20%.^[79] Because losses are small in comparison to the large amount of the two B-vitamins present, milk continues to provide significant amounts of thiamin and vitamin B12. The loss of vitamin C is not nutritionally significant, as milk is not an important dietary source of vitamin C.

A newer process, ultrapasteurization or ultra-high temperature treatment (UHT), heats the milk to a higher temperature for a shorter amount of time. This extends its shelf life and allows the milk to be stored unrefrigerated because of the longer lasting sterilization effect.

Microfiltration

Microfiltration is a process that partially replaces pasteurization and produces milk with fewer microorganisms and longer shelf life without a change in the taste of the milk. In this process, cream is separated from the whey and is pasteurized in the usual way, but the whey is forced through ceramic microfilters that trap 99.9% of microorganisms in the milk (as compared to 99.999% killing of microorganisms in standard HTST pasteurization). The whey then is recombined with the pasteurized cream to reconstitute the original milk composition.

Creaming and homogenization

A milking machine in action

Upon standing for 12 to 24 hours, fresh milk has a tendency to separate into a high-fat cream layer on top of a larger, low-fat milk layer. The cream often is sold as a separate product with its own uses. Today the separation of the cream from the milk usually is accomplished rapidly in centrifugal cream separators. The fat globules rise to the top of a container of milk because fat is less dense than water. The smaller the globules, the more other molecular-level forces prevent this from happening. In fact, the cream rises in cow's milk much more quickly than a simple model would predict: rather than isolated globules, the fat in the milk tends to form into clusters containing about a million globules, held together by a number of minor whey proteins.^[19] These clusters rise faster than individual globules can. The fat globules in milk from goats, sheep, and water buffalo do not form clusters as readily and are smaller to begin with, resulting in a slower separation of cream from these milks.

Milk often is homogenized, a treatment that prevents a cream layer from separating out of the milk. The milk is pumped at high pressures through very narrow tubes, breaking up the fat globules through turbulence and cavitation.^[80] A greater number of smaller particles possess more total surface area than a smaller number of larger ones, and the original fat globule membranes cannot completely cover them. Casein micelles are attracted to the newly exposed fat surfaces. Nearly one-third of the micelles in the milk end up participating in this new membrane structure. The casein weighs down the globules and interferes with the clustering that accelerated separation. The exposed fat globules are vulnerable to certain enzymes present in milk, which could break down the fats and produce rancid flavors. To prevent this, the enzymes are inactivated by pasteurizing the milk immediately before or during homogenization.

Homogenized milk tastes blander but feels creamier in the mouth than unhomogenized. It is whiter and more resistant to developing off flavors.^[19] Creamline (or cream-top) milk is unhomogenized. It may or may not have been pasteurized. Milk that has undergone high-pressure homogenization, sometimes labeled as "ultra-homogenized," has a longer shelf life than milk that has undergone ordinary homogenization at lower pressures.^[81]

Nutrition and health

The composition of milk differs widely among species. Factors such as the type of protein; the proportion of protein, fat, and sugar; the levels of various vitamins and minerals; and the size of the butterfat globules, and the strength of the curd are among those that may vary.^[21] For example:

• Human milk contains, on average, 1.1% protein, 4.2% fat, 7.0% lactose (a sugar), and supplies 72 kcal of energy per 100 grams.
• Cow's milk contains, on average, 3.4% protein, 3.6% fat, and 4.6% lactose, 0.7% minerals^[82] and supplies 66 kcal of energy per 100 grams. See also Nutritional value further on

Donkey and horse milk have the lowest fat content, while the milk of seals and whales may contain more than 50% fat.^[83][84]

Milk composition analysis, per 100 grams^[85][86]

Constituents	Unit	Cow	Goat	Sheep	Water buffalo
Water	g	87.8	88.9	83.0	81.1
Protein	g	3.2	3.1	5.4	4.5
Fat	g	3.9	3.5	6.0	8.0
----Saturated fatty acids	g	2.4	2.3	3.8	4.2
----Monounsaturated fatty acids	g	1.1	0.8	1.5	1.7
----Polyunsaturated fatty acids	g	0.1	0.1	0.3	0.2
Carbohydrate (i.e the sugar form of lactose)	g	4.8	4.4	5.1	4.9
Cholesterol	mg	14	10	11	8
Calcium	mg	120	100	170	195
Energy	kcal	66	60	95	110
	kJ	275	253	396	463

Cow's milk

These compositions vary by breed, animal, and point in the lactation period.

Milk fat percentages

Cow breed	Approximate percentage
Jersey	5.2
Zebu	4.7
Brown Swiss	4.0
Holstein-Friesian	3.6

The protein range for these four breeds is 3.3% to 3.9%, while the lactose range is 4.7% to 4.9%.^[19]

Milk fat percentages may be manipulated by dairy farmers' stock diet formulation strategies. Mastitis infection can cause fat levels to decline.^[87]

Nutritional value

Nutrient contents in %DV of common foods (raw, uncooked) per 100 g

	Protein		Vitamins													Minerals
Food	DV	Q	A	B1	B2	B3	B5	B6	B9	B12	Ch.	C	D	E	K	Ca	Fe	Mg	P	K	Na	Zn	Cu	Mn	Se
cooking Reduction %			10	30	20	25		25	35	0	0	30				10	15	20	10	20	5	10	25
Corn	20	55	1	13	4	16	4	19	19	0	0	0	0	0	1	1	11	31	34	15	1	20	10	42	0
Rice	14	71	0	12	3	11	20	5	2	0	0	0	0	0	0	1	9	6	7	2	0	8	9	49	22
Wheat	27	51	0	28	7	34	19	21	11	0	0	0	0	0	0	3	20	36	51	12	0	28	28	151	128
Soybean	73	132	0	58	51	8	8	19	94	0	24	10	0	4	59	28	87	70	70	51	0	33	83	126	25
Pigeon pea	43	91	1	43	11	15	13	13	114	0	0	0	0	0	0	13	29	46	37	40	1	18	53	90	12
Potato	4	112	0	5	2	5	3	15	4	0	0	33	0	0	2	1	4	6	6	12	0	2	5	8	0
Sweet potato	3	82	284	5	4	3	8	10	3	0	0	4	0	1	2	3	3	6	5	10	2	2	8	13	1
Spinach	6	119	188	5	11	4	1	10	49	0	4.5	47	0	10	604	10	15	20	5	16	3	4	6	45	1
Dill	7	32	154	4	17	8	4	9	38	0	0	142	0	0	0	21	37	14	7	21	3	6	7	63	0
Carrots	2		334	4	3	5	3	7	5	0	0	10	0	3	16	3	2	3	4	9	3	2	2	7	0
Guava	5	24	12	4	2	5	5	6	12	0	0	381	0	4	3	2	1	5	4	12	0	2	11	8	1
Papaya	1	7	22	2	2	2	2	1	10	0	0	103	0	4	3	2	1	2	1	7	0	0	1	1	1
Pumpkin	2	56	184	3	6	3	3	3	4	0	0	15	0	5	1	2	4	3	4	10	0	2	6	6	0
Sunflower oil	0		0	0	0	0	0	0	0	0	0	0	0	205	7	0	0	0	0	0	0	0	0	0	0
Egg	25	136	10	5	28	0	14	7	12	22	45	0	9	5	0	5	10	3	19	4	6	7	5	2	45
Milk	6	138	2	3	11	1	4	2	1	7	2.6	0	0	0	0	11	0	2	9	4	2	3	1	0	5

Ch. = Choline; Ca = Calcium; Fe = Iron; Mg = Magnesium; P = Phosphorus; K = Potassium; Na = Sodium; Zn = Zinc; Cu = Copper; Mn = Manganese; Se = Selenium; %DV = % daily value i.e. % of DRI (Dietary Reference Intake) Note: All nutrient values including protein are in %DV per 100 grams of the food item. Significant values are highlighted in light Gray color and bold letters.^[88][89] Cooking reduction = % Maximum typical reduction in nutrients due to boiling without draining for ovo-lacto-vegetables group^[90][91] Q = Quality of Protein in terms of completeness without adjusting for digestability.^[91]

Cow's milk (whole)

Nutritional value per 100 g (3.5 oz)
Energy	252 kJ (60 kcal)
Carbohydrates	5.26 g
Sugars lactose	5.26 g 5.26 g
Fat	3.25 g
Saturated	1.865 g
Monounsaturated	0.812 g
Polyunsaturated	0.195 g
Protein	3.22 g
Tryptophan	0.075 g
Threonine	0.143 g
Isoleucine	0.165 g
Leucine	0.265 g
Lysine	0.140 g
Methionine	0.075 g
Cystine	0.017 g
Phenylalanine	0.147 g
Tyrosine	0.152 g
Valine	0.192 g
Arginine	0.075 g
Histidine	0.075 g
Alanine	0.103 g
Aspartic acid	0.237 g
Glutamic acid	0.648 g
Glycine	0.075 g
Proline	0.342 g
Serine	0.107 g
Vitamins
Vitamin A equiv.	(6%) 46 μg
Thiamine (B1)	(4%) 0.044 mg
Riboflavin (B2)	(15%) 0.183 mg
Vitamin B12	(19%) 0.45 μg
Choline	(3%) 14.3 mg
Vitamin D	(0%) 2 IU
Minerals
Calcium	(11%) 113 mg
Magnesium	(3%) 10 mg
Potassium	(3%) 132 mg
Sodium	(3%) 43 mg
Other constituents
Water	88.32 g
100 mL corresponds to 103 g.[92]
Units μg = micrograms • mg = milligrams IU = International units
Percentages are roughly approximated using US recommendations for adults. Source: USDA Nutrient Database

Processed cow's milk was formulated to contain differing amounts of fat during the 1950s. One cup (250 ml) of 2%-fat cow's milk contains 285 mg of calcium, which represents 22% to 29% of the daily recommended intake (DRI) of calcium for an adult. Depending on its age, milk contains 8 grams of protein, and a number of other nutrients (either naturally or through fortification) including:

• Biotin
• Iodine
• Magnesium
• Pantothenic acid
• Potassium
• Riboflavin
• Selenium
• Thiamine
• Vitamin A
• Vitamin B₁₂
• Vitamins D
• Vitamin K

The amount of calcium from milk that is absorbed by the human body is disputed.^[93] Calcium from dairy products has a greater bioavailability than calcium from certain vegetables, such as spinach, that contain high levels of calcium-chelating agents,^[94] but a similar or lesser bioavailability than calcium from low-oxalate vegetables such as kale, broccoli, or other vegetables in the Brassica genus.^[95][96]

Milk as a calcium source has been questioned in media, but scientific research is lacking to support the hypothesis of acidosis induced by milk. The hypothesis in question being that acidosis would lead to leeching of calcium storages in bones to neutralize pH levels (also known as acid-ash hypothesis). Research has found no link between metabolic acidosis and consumption of milk.^[97][98][99]

Recommended consumption

The U.S. federal government document Dietary Guidelines for Americans, 2010^[100] recommends consumption of three glasses of fat-free or low-fat milk for adults and children 9 and older (less for younger children) per day. This recommendation is disputed by some health researchers who call for more study of the issue,^[101] given that there are other sources for calcium and vitamin D. The researchers also claim that the recommendations have been unduly influenced by the American dairy industry, and that whole milk may be better for health due to its increased ability to satiate hunger.

Medical research

There is recent evidence suggesting consumption of milk is effective at promoting muscle growth.^[102] Some studies have suggested that conjugated linoleic acid, which can be found in dairy products, is an effective supplement for reducing body fat.^[103]

With regards to the claim of milk promoting stronger bones, there has been no association between milk consumption and risk of hip fractures in women.^[104]

Milk and dairy products have the potential for causing serious infection in newborn infants. Unpasteurized milk and cheeses can promote the growth of Listeria bacteria. Listeria monocytogenes can also cause serious infection in an infant and pregnant woman and can be transmitted to her infant in utero or after birth. The infection has the potential of seriously harming or even causing the death of a preterm infant, an infant of low or very low birth weight, or an infant with an immune system defect or a congenital defect of the immune system. The presence of this pathogen can sometimes be determined by the symptoms that appear as a gastrointestinal illness in the mother. The mother can also acquire infection from ingesting food that contains other animal products such as, hot dogs, delicatessen meats, and cheese.^[105]

Lactose intolerance

Lactose, the disaccharide sugar component of all milk, must be cleaved in the small intestine by the enzyme, lactase, in order for its constituents, galactose and glucose, to be absorbed. The production of the enzyme lactase declines significantly after weaning in all mammals. Consequently, many humans become unable to digest lactose properly as they mature. There is a great deal of variance, with some individuals reacting badly to even small amounts of lactose, some able to consume moderate quantities, and some able to consume large quantities of milk and other dairy products without problems. The gene in humans that controls lactase production, and hence lactose tolerance and intolerance, is labeled C/T-13910.^[106] An individual who consumes milk without producing sufficient lactase may suffer diarrhea, intestinal gas, cramps and bloating, as the undigested lactose travels through the gastrointestinal tract and serves as nourishment for intestinal microflora that excrete gas in processes known as fermentation and anaerobic respiration.

It is estimated that 30 to 50 million Americans are lactose intolerant, including 75% of Native Americans and African Americans, and 90% of Asian Americans. Lactose intolerance is less common among those descended from northern Europeans.^[107] Other genetic groups that have a lower prevalence of lactose intolerance are the Tuareg of the Sahara, the Fulani of the West African Sahel, and the Beja and Kabbabish of Sudan, as well as possibly the Tutsi population of the Uganda–Rwanda area.^[108] Another locus of lactose tolerance is in Northern India.^[106]

Lactose intolerance is a natural process and there is no reliable way to prevent or reverse it.

Having lactose intolerance doesn't mean saying goodbye to dairy forever. Some dairy foods are easier to digest than others, including yogurt and aged cheese. Lactose-intolerant people vary in how much lactose they can tolerate, but dairy and aged cheese are easier to digest because processing has already broken down some of the lactose. If you take supplemental lactase, which is an enzyme that breaks down lactose, you can generally enjoy these foods and other dairy products without experiencing the unpleasant side effects.^[109]

Possible harms

Some studies suggest that milk consumption may increase the risk of suffering from certain health problems. Cow's milk allergy (CMA) is an immunologically mediated adverse reaction, rarely fatal, to one or more cow's milk proteins.^[110] Milk from any mammal contains amino acids and microRNA which influence the drinker's metabolism and growth;^[111] this "programming" is beneficial for milk's natural consumers, namely infants of the same species as the milk producer, but post-infancy and trans-species milk consumption affects the mTORC1 metabolic pathway and may promote diseases of civilization such as obesity and diabetes.^[111][112]

Milk contains casein, a substance that breaks down in the human stomach to produce casomorphin, an opioid peptide. In the early 1990s it was hypothesized that casomorphin can cause or aggravate autism spectrum disorders,^[113][114] and casein-free diets are widely promoted. Studies supporting these claims have had significant flaws, and the data are inadequate to guide autism treatment recommendations.^[114][115]

A study demonstrated that men who drink a large amount of milk and consume dairy products were at a slightly increased risk of developing Parkinson's disease; the effect for women was smaller.^[116] The reason behind this is not fully understood, and it also remains unclear why there is less of a risk for women.^[116][117]

The most recent assessment by the World Cancer Research Fund and the American Institute for Cancer Research found that most individual epidemiological studies showed increased risk of prostate cancer with increased intake of milk or dairy products.^[118] "Meta-analysis of cohort data produced evidence of a clear dose-response relationship between advanced/aggressive cancer risk with milk intake, and between all prostate cancer risk and milk and dairy products." Possible mechanisms proposed included inhibition of the conversion of vitamin D to its active metabolite, 1,25- dihydroxy vitamin D3 by calcium (which some evidence suggests increases cell proliferation in the prostate), and elevation of levels of insulin-like growth factor-1 (IGF-1).^[118] Several sources suggest a correlation between high calcium intake from milk, in particular, and prostate cancer,^{[119][120][121]} consistent with a calcium/vitamin D based mechanism. Overall, the WCRF/AICR panel concluded that "The evidence is inconsistent from both cohort and case-control studies. There is limited evidence suggesting that milk and dairy products are a cause of prostate cancer."^[118]

Medical studies also have shown a possible link between milk consumption and the exacerbation of diseases such as Crohn's disease,^[122] Hirschsprung's disease–mimicking symptoms in babies with existing cow's milk allergies,^[123] and the aggravation of Behçet's disease.^[124]

Flavored milk in US schools

Milk must be offered at every meal if a United States school district wishes to get reimbursement from the federal government.^[125] A quarter of the largest school districts in the US offer rice or soy milk and almost 17% of all US school districts offer lactose-free milk. Seventy-one percent of the milk served in US school cafeterias is flavored, causing some school districts to propose a ban because flavored milk has added sugars. (Though some flavored milk products use artificial sweeteners instead.) The Boulder, Colorado, school district banned flavored milk in 2009 and instead installed a dispenser that keeps the milk colder.^[125]

Bovine growth hormone supplementation

Since November 1993, recombinant bovine somatotropin (rbST), also called rBGH, has been sold to dairy farmers with FDA approval.^[126] Cows produce bovine growth hormone naturally, but some producers administer an additional recombinant version of BGH which is produced through a genetically engineered E. coli because it increases milk production. Bovine growth hormone also stimulates liver production of insulin-like growth factor 1 (IGF1). Monsanto has stated that both of these compounds are harmless given the levels found in milk and the effects of pasteurization.^[127]

On June 9, 2006, the largest milk processor in the world and the two largest supermarkets in the United States – Dean Foods, Wal-Mart, and Kroger – announced that they are "on a nationwide search for rBGH-free milk."^[128] Milk from cows given rBST may be sold in the United States, and the FDA stated that no significant difference has been shown between milk derived from rBST-treated and that from non-rBST-treated cows.^[129] Milk that advertises that it comes from cows not treated with rBST, is required to state this finding on its label.

Cows receiving rBGH supplements may more frequently contract an udder infection known as mastitis.^[130] Problems with mastitis have led to Canada, Australia, New Zealand, and Japan banning milk from rBST treated cows. Mastitis, among other diseases, may be responsible for the fact that levels of white blood cells in milk vary naturally.^[131][132]

rBGH is also banned in the European Union.^[133]

Criticism

Vegans and some other vegetarians do not consume milk for reasons mostly related to animal rights and environmental concerns. They may object to features of dairy farming including the necessity of keeping dairy cows pregnant, the killing of almost all the male offspring of dairy cows (either by disposal soon after birth, for veal production, or for beef), the routine separation of mother and calf soon after birth, other perceived inhumane treatment of dairy cattle, and culling of cows after their productive lives.^[134]

Some have criticized the American government's promotion of milk consumption. The main concern is the financial interest that the American government has taken in the dairy industry, promoting milk as the best source of calcium. All United States schools that are a part of the federally funded National School Lunch Act are required by the federal government to provide milk for all students. The Office of Dietary Supplements recommends that healthy adults between ages 19 and 50 get about 1,000 mg of calcium per day,^[135] but studies show that the human body can only retain about 550 mg of calcium per day.

There is also some skepticism of the idea that large doses of calcium provide for healthier bones and teeth. This is a commonly held belief, but there have been some studies that show there is "no connection between the intake of calcium (in any form) and the reduced risk of bone fractures in women aged 34-71 years".^[136] Another study suggests that calcium supplements do not contribute to bone gain when a daily intake of 800 mg is surpassed.

In 2011, The Journal of Bone and Mineral Research published a meta-analysis examining whether milk consumption might protect against hip fracture in middle-aged and older adults. Studies could find no association between drinking milk and lower rates of fractures. In 2014, JAMA Pediatrics published a report after monitoring almost 100,000 men and women for more than two decades. Subjects were asked to report on how much milk they had consumed as teenagers, and were followed to see if there is any association with a reduced chance of hip fractures later in life, it found there was not any. A study published in The BMJ that followed more than 45,000 men and 61,000 women in Sweden age 39 and older had similar results. Milk consumption in adults was associated with no protection for men, and an increased risk of fractures in women. The risk of any bone fracture increased 16 percent in women who drank three or more glasses daily, and the risk of a broken hip increased 60 percent. It was also associated with an increased risk of death in both sexes.^[137][138]

Milk production is also resource intensive. On a global weighted average, 250 ml of milk production uses 250 liters of fresh water, or 1 gallon of milk uses 1,000 gallons of fresh water.^[139]

Varieties and brands

Glass milk bottle used for home delivery service in the UK.

Milk products are sold in a number of varieties based on types/degrees of

• additives (e.g., vitamins),
• age (e.g., cheddar),
• coagulation (e.g., cottage cheese),
• farming method (e.g., organic, grass-fed).
• fat content (e.g., half and half),
• fermentation (e.g., buttermilk),
• flavoring (e.g., chocolate and strawberry),
• homogenization (e.g., cream top),
• reduction or elimination of lactose,
• mammal (e.g., cow, goat, sheep),
• packaging (e.g., bottle),
• pasteurization (e.g., raw milk),
• water content (e.g., dry milk)

Milk preserved by the UHT process does not need to be refrigerated before opening and has a longer shelf life than milk in ordinary packaging. It is typically sold unrefrigerated in the UK, US, Europe, Latin America, and Australia.

Reduction or elimination of lactose

Lactose-free milk can be produced by passing milk over lactase enzyme bound to an inert carrier. Once the molecule is cleaved, there are no lactose ill effects. Forms are available with reduced amounts of lactose (typically 30% of normal), and alternatively with nearly 0%. The only noticeable difference from regular milk is a slightly sweeter taste due to the generation of glucose by lactose cleavage. It does not, however, contain more glucose, and is nutritionally identical to regular milk.

Finland, where approximately 17% of the Finnish-speaking population has hypolactasia,^[140] has had "HYLA" (acronym for hydrolysed lactose) products available for many years. Lactose of low-lactose level cow's milk products, ranging from ice cream to cheese, is enzymatically hydrolysed into glucose and galactose. The ultra-pasteurization process, combined with aseptic packaging, ensures a long shelf life. In 2001, Valio launched a lactose-free milk drink that is not sweet like HYLA milk but has the fresh taste of ordinary milk. Valio patented the chromatographic separation method to remove lactose. Valio also markets these products in Sweden, Estonia, Belgium,^[141] and the United States, where the company says ultrafiltration is used.^[142]

In the UK, where an estimated 15% of the population are affected by lactose intolerance, Lactofree produces milk, cheese, and yogurt products that contain only 0.03% lactose.

To aid digestion in those with lactose intolerance, milk with added bacterial cultures such as Lactobacillus acidophilus ("acidophilus milk") and bifidobacteria ("a/B milk") is available in some areas.^[143] Another milk with Lactococcus lactis bacteria cultures ("cultured buttermilk") often is used in cooking to replace the traditional use of naturally soured milk, which has become rare due to the ubiquity of pasteurization, which also kills the naturally occurring Lactococcus bacteria.^[144]

Additives and flavoring

In areas where the cattle (and often the people) live indoors, commercially sold milk commonly has vitamin D added to it to make up for lack of exposure to UVB radiation.

Reduced-fat milks often have added vitamin A palmitate to compensate for the loss of the vitamin during fat removal; in the United States this results in reduced fat milks having a higher vitamin A content than whole milk.^[145]

Milk often has flavoring added to it for better taste or as a means of improving sales. Chocolate milk has been sold for many years and has been followed more recently by strawberry milk and others. Some nutritionists have criticized flavored milk for adding sugar, usually in the form of high-fructose corn syrup, to the diets of children who are already commonly obese in the US.^[146]

Distribution

Returning reusable glass milk bottles, used for home delivery service in the UK

A glass bottle of non-homogenized, organic, local milk from the US state of California. American milk bottles are generally rectangular in shape

A rectangular milk jug design used by Costco and Sam's Club stores in the United States which allows for stacking and display of filled containers rather than being shipped to the store in milk crates and manual loading into a freezer display rack.

Due to the short shelf life of normal milk, it used to be delivered to households daily in many countries; however, improved refrigeration at home, changing food shopping patterns because of supermarkets, and the higher cost of home delivery mean that daily deliveries by a milkman are no longer available in most countries.

Australia and New Zealand

In Australia and New Zealand, prior to metrication, milk was generally distributed in 1 pint (568ml) glass bottles. In Australia and Ireland there was a government funded "free milk for school children" program, and milk was distributed at morning recess in 1/3 pint bottles. With the conversion to metric measures, the milk industry were concerned that the replacement of the pint bottles with 500ml bottles would result in a 13.6% drop in milk consumption; hence, all pint bottles were recalled and replaced by 600 mL bottles. With time, due to the steadily increasing cost of collecting, transporting, storing and cleaning glass bottles, they were replaced by cardboard cartons. A number of designs were used, including a tetrahedron which could be close-packed without waste space, and could not be knocked over accidentally. (slogan: No more crying over spilt milk.) However, the industry eventually settled on a design similar to that used in the United States.^[147]

Milk is now available in a variety of sizes in cardboard cartons (250 mL, 375 mL, 600 mL, 1 liter and 1.5 liters) and plastic bottles (1, 2 and 3 liters). A significant addition to the marketplace has been "long-life" milk (UHT), generally available in 1 and 2 liter rectangular cardboard cartons. In urban and suburban areas where there is sufficient demand, home delivery is still available, though in suburban areas this is often 3 times per week rather than daily. Another significant and popular addition to the marketplace has been flavored milks – for example, as mentioned above, Farmers Union Iced Coffee outsells Coca-Cola in South Australia.

India

In rural India, milk is home delivered, daily, by local milkmen carrying bulk quantities in a metal container, usually on a bicycle. In other parts of metropolitan India, milk is usually bought or delivered in plastic bags or cartons via shops or supermarkets.

The current milk chain flow in India is from milk producer to milk collection agent. Then it is transported to a milk chilling center and bulk transported to the processing plant, then to the sales agent and finally to the consumer.

A 2011 survey by the Food Safety and Standards Authority of India found that nearly 70 per cent of samples had not conformed to the standards set for milk. The study found that due to lack of hygiene and sanitation in milk handling and packaging, detergents (used during cleaning operations) were not washed properly and found their way into the milk. About eight per cent of samples in the survey were found to have detergents, which are hazardous to health.^[148]

Pakistan

In Pakistan, milk is supplied in jugs. Milk has been a staple food, especially among the pastoral tribes in this country.

United Kingdom

Since the late 1990s, milk-buying patterns have changed drastically in the UK. The classic milkman, who travels his local milk round (route) using a milk float (often battery powered) during the early hours and delivers milk in 1 pint glass bottles with aluminium foil tops directly to households, has almost disappeared. Two of the main reasons for the decline of UK home deliveries by milkmen are household refrigerators (which lessen the need for daily milk deliveries) and private car usage (which has increased supermarket shopping). Another factor is that it is cheaper to purchase milk from a supermarket than from home delivery. In 1996, more than 2.5 billion liters of milk were still being delivered by milkmen, but by 2006 only 637 million liters (13% of milk consumed) was delivered by some 9,500 milkmen.^[149] By 2010, the estimated number of milkmen had dropped to 6,000.^[150] Assuming that delivery per milkman is the same as it was in 2006, this means milkmen deliveries now only account for 6–7% of all milk consumed by UK households (6.7 billion liters in 2008/2009).^[151]

Almost 95% of all milk in the UK is thus sold in shops today, most of it in plastic bottles of various sizes, but some also in milk cartons. Milk is hardly ever sold in glass bottles in UK shops.

United States

Getting milk at the back door ~ 1940

In the United States, glass milk bottles have been replaced mostly with milk cartons and plastic jugs. Gallons of milk are almost always sold in jugs, while half gallons and quarts may be found in both paper cartons and plastic jugs, and smaller sizes are almost always in cartons.

The "half pint" .5 US pints (0.24 l; 0.42 imp pt) milk carton is the traditional unit as a component of school lunches, though some companies have replaced that unit size with a plastic bottle, which is also available at retail in 6- and 12-pack size.

Packaging

Glass milk bottles are now rare. Most people purchase milk in bags, plastic bottles, or plastic-coated paper cartons. Ultraviolet (UV) light from fluorescent lighting can alter the flavor of milk, so many companies that once distributed milk in transparent or highly translucent containers are now using thicker materials that block the UV light. Milk comes in a variety of containers with local variants:

Australia and New Zealand

Distributed in a variety of sizes, most commonly in aseptic cartons for up to 1.5 liters, and plastic screw-top bottles beyond that with the following volumes; 1.1 L, 2 L, and 3 L. 1 liter milk bags are starting to appear in supermarkets, but have not yet proved popular. Most UHT-milk is packed in 1 or 2 liter paper containers with a sealed plastic spout.^[147]

Brazil

Used to be sold in cooled 1 liter bags, just like in South Africa. Today the most common form is 1 liter aseptic cartons containing UHT skimmed, semi-skimmed or whole milk, although the plastic bags are still in use for pasteurized milk. Higher grades of pasteurized milk can be found in cartons or plastic bottles. Sizes other than 1 liter are rare.

Canada

1.33 liter plastic bags (sold as 4 liters in 3 bags) are widely available in some areas (especially the Maritimes, Ontario and Quebec), although the 4 liter plastic jug has supplanted them in western Canada. Other common packaging sizes are 2 liter, 1 liter, 500 mL, and 250 mL cartons, as well as 4 liter, 1 liter, 250 mL aseptic cartons and 500 mL plastic jugs.

Chile

Distributed most commonly in aseptic cartons for up to 1 liter, but smaller, snack-sized cartons are also popular. The most common flavors, besides the natural presentation, are chocolate, strawberry and vanilla.

China

Sweetened milk is a drink popular with students of all ages and is often sold in small plastic bags complete with straw. Adults not wishing to drink at a banquet often drink milk served from cartons or milk tea.

Colombia

Sells milk in 1 liter plastic bags.

Croatia, Bosnia and Herzegovina, Serbia, Montenegro

UHT milk (trajno mlijeko/trajno mleko/трајно млеко) is sold in 500 mL and 1 L (sometimes also 200 ml) aseptic cartons. Non-UHT pasteurized milk (svježe mlijeko/sveže mleko/свеже млеко) is most commonly sold in 1 L and 1.5 L PET bottles, though in Serbia one can still find milk in plastic bags.

Parts of Europe

Sizes of 500 mL, 1 liter (the most common), 1.5 liters, 2 liters and 3 liters are commonplace.

Finland

Commonly sold in 1 L or 1.5 L cartons, in some places also in 2 dl and 5 dl cartons.

Germany

Commonly sold in 1-liter cartons. Sale in 1-liter plastic bags (common in the 1980s) now rare.

Hong Kong

Milk is sold in glass bottles (220 mL), cartons (236 mL and 1 L), plastic jugs (2 liters) and aseptic cartons (250 mL).

India

Commonly sold in 500 mL plastic bags and in bottles in some parts like in west. It is still customary to serve the milk boiled, despite pasteurization. Milk is often buffalo milk. Flavored milk is sold in most convenience stores in waxed cardboard containers. Convenience stores also sell many varieties of milk (such as flavored and ultra-pasteurized) in different sizes, usually in aseptic cartons.

Indonesia

Usually sold in 1 liter cartons, but smaller, snack-sized cartons are available.

Israel

Non-UHT milk is most commonly sold in 1 liter waxed cardboard boxes and 1 liter plastic bags. It may also be found in 0.5 L and 2 L waxed cardboard boxes, 2 L plastic jugs and 1 L plastic bottles. UHT milk is available in 1 liter (and less commonly also in 0.25 L) carton "bricks".

Japan

Commonly sold in 1 liter waxed paperboard cartons. In most city centers there is also home delivery of milk in glass jugs. As seen in China, sweetened and flavored milk drinks are commonly seen in vending machines.

South Korea

Sold in cartons (180 mL, 200 mL, 500 mL 900 mL, 1 L, 1.8 L, 2.3 L), plastic jugs (1 L and 1.8 L), aseptic cartons (180 mL and 200 mL) and plastic bags (1 L).

Pakistan

Milk is supplied in 500 mL Plastic bags and carried in Jugs from rural to cities and sell

Philippines

Milk is supplied in 1000 mL Plastic bottles and delivered from factories to cities and sell

Poland

UHT milk is mostly sold in aseptic cartons (500 mL, 1 L, 2 L), and non-UHT in 1 L plastic bags or plastic bottles. Milk, UHT is commonly boiled, despite being pasteurized.

South Africa

Commonly sold in 1 liter bags. The bag is then placed in a plastic jug and the corner cut off before the milk is poured.

Sweden

Commonly sold in 0.3 L, 1 L or 1.5 L cartons and sometimes as plastic or glass milk bottles.

Turkey

Commonly sold in 500 mL or 1L cartons or special plastic bottles. UHT milk is more popular. Milkmen also serve in smaller towns and villages.

United Kingdom

Most stores stock imperial sizes: 1 pint (568 mL), 2 pints (1.136 L), 4 pints (2.273 L), 6 pints (3.408 L) or a combination including both metric and imperial sizes. Glass milk bottles delivered to the doorstep by the milkman are typically pint-sized and are returned empty by the householder for repeated reuse. Milk is sold at supermarkets in either aseptic cartons or HDPE bottles. Supermarkets have also now begun to introduce milk in bags, to be poured from a proprietary jug and nozzle.

United States

Commonly sold in gallon (3.78 L), half-gallon (1.89 L) and quart (0.94 L) containers of natural-colored HDPE resin, or, for sizes less than one gallon, cartons of waxed paperboard. Bottles made of opaque PET are also becoming commonplace for smaller, particularly metric, sizes such as one liter. The US single-serving size is usually the half-pint (about 240 mL). Less frequently, dairies deliver milk directly to consumers, from coolers filled with glass bottles which are typically half-gallon sized and returned for reuse. Some convenience store chains in the United States (such as Kwik Trip in the Midwest) sell milk in half-gallon bags, while another rectangular cube gallon container design used for easy stacking in shipping and displaying is used by warehouse clubs such as Costco and Sam's Club, along with some Wal-Mart stores.^[152]

Uruguay

Commonly sold in 1 liter bags. The bag is then placed in a plastic jug and the corner cut off before the milk is poured.

Practically everywhere, condensed milk and evaporated milk are distributed in metal cans, 250 and 125 mL paper containers and 100 and 200 mL squeeze tubes, and powdered milk (skim and whole) is distributed in boxes or bags.

Spoilage and fermented milk products

Yakult, a probiotic milk-like product made by fermenting a mixture of skimmed milk with a special strain of the bacterium Lactobacillus casei Shirota.

When raw milk is left standing for a while, it turns "sour". This is the result of fermentation, where lactic acid bacteria ferment the lactose in the milk into lactic acid. Prolonged fermentation may render the milk unpleasant to consume. This fermentation process is exploited by the introduction of bacterial cultures (e.g. Lactobacilli sp., Streptococcus sp., Leuconostoc sp., etc.) to produce a variety of fermented milk products. The reduced pH from lactic acid accumulation denatures proteins and causes the milk to undergo a variety of different transformations in appearance and texture, ranging from an aggregate to smooth consistency. Some of these products include sour cream, yogurt, cheese, buttermilk, viili, kefir, and kumis. See Dairy product for more information.

Pasteurization of cow's milk initially destroys any potential pathogens and increases the shelf life, but eventually results in spoilage that makes it unsuitable for consumption. This causes it to assume an unpleasant odor, and the milk is deemed non-consumable due to unpleasant taste and an increased risk of food poisoning. In raw milk, the presence of lactic acid-producing bacteria, under suitable conditions, ferments the lactose present to lactic acid. The increasing acidity in turn prevents the growth of other organisms, or slows their growth significantly. During pasteurization, however, these lactic acid bacteria are mostly destroyed.

In order to prevent spoilage, milk can be kept refrigerated and stored between 1 and 4 °C (34 and 39 °F) in bulk tanks. Most milk is pasteurized by heating briefly and then refrigerated to allow transport from factory farms to local markets. The spoilage of milk can be forestalled by using ultra-high temperature (UHT) treatment. Milk so treated can be stored unrefrigerated for several months until opened but has a characteristic "cooked" taste. Condensed milk, made by removing most of the water, can be stored in cans for many years, unrefrigerated, as can evaporated milk. The most durable form of milk is powdered milk, which is produced from milk by removing almost all water. The moisture content is usually less than 5% in both drum- and spray-dried powdered milk.

Freezing of milk can cause fat globule aggregation upon thawing, resulting in milky layers and butterfat lumps. These can be dispersed again by warming and stirring the milk.^[153] It can change the taste by destruction of milk-fat globule membranes, releasing oxidized flavors.^[153]

Language and culture

Hindu Abhisheka ritual in Agara, Bangalore Rural District, Karnataka.

The importance of milk in human culture is attested to by the numerous expressions embedded in our languages, for example, "the milk of human kindness". In ancient Greek mythology, the goddess Hera spilled her breast milk after refusing to feed Heracles, resulting in the Milky Way.

In many African and Asian countries, butter is traditionally made from fermented milk rather than cream. It can take several hours of churning to produce workable butter grains from fermented milk.^[154]

Holy books have also mentioned milk. The Bible contains references to the 'Land of Milk and Honey'. In the Qur'an, there is a request to wonder on milk as follows: 'And surely in the livestock there is a lesson for you, We give you to drink of that which is in their bellies from the midst of digested food and blood, pure milk palatable for the drinkers.'(16-The Honeybee, 66). The Ramadan fast is traditionally broken with a glass of milk and dates.

Abhisheka is conducted by Hindu and Jain priests, by pouring libations on the image of a deity being worshipped, amidst the chanting of mantras. Usually offerings such as milk, yogurt, ghee, honey may be poured among other offerings depending on the type of abhishekam being performed.

To milk someone, in the vernacular of many English-speaking countries, is to take advantage of the person.

The word "milk" has had many slang meanings over time. In the 19th century, milk was used to describe a cheap alcoholic drink made from methylated spirits mixed with water. The word was also used to mean defraud, to be idle, to intercept telegrams addressed to someone else, and a weakling or 'milksop'. In the mid-1930s, the word was used in Australia meaning to siphon gas from a car.^[155]

Other uses

Besides serving as a beverage or source of food, milk has been described as used by farmers and gardeners as an organic fungicide and fertilizer,^{[156][157][158]} however, its effectiveness is debated. Diluted milk solutions have been demonstrated to provide an effective method of preventing powdery mildew on grape vines, while showing it is unlikely to harm the plant.^[159][160]

See also

A2 milk Babcock test (determines the butterfat content of milk) Health mark Human breast milk Lactation

List of dairy products Milk line Milk paint Operation Flood Raw milk

References

1. Pehrsson, P.R.; Haytowitz, D.B.; Holden, J.M.; Perry, C.R. and Beckler, D.G. (2000). "USDA's National Food and Nutrient Analysis Program: Food Sampling" (PDF). Journal of Food Composition and Analysis 13 (4): 379–389. doi:10.1006/jfca.1999.0867. Archived from the original (PDF) on April 7, 2003.
2. "Food Outlook – Global Market Analysis" (PDF). Food and Agriculture Organization of the United Nations. May 2012. pp. 8, 51–54.
3. "World Dairy Cow Numbers". [FAO]. January 14, 2014. Retrieved March 23, 2014.
4. Anand Kumar. "India emerging as a leading milk product exporter". dawn.com.
5. "Government scraps incentive on milk powder exports to check prices". timesofindia-economictimes.
6. "Milk quality in India". milkproduction.com.
7. Blasko, B. (2011). "WORLD IMPORTANCE AND PRESENT TENDENCIES OF DAIRY SECTOR" (PDF). University of Debrecen.
8. "Food Outlook – Milk and Milk Products". FAO, United Nations. 2010.
9. Gagnon-Joseph, Nathalie (February 17, 2016). "Three approaches to the milk glut". The Chronicle (Barton, Vermont). pp. 1A, 24A, 25A. Retrieved March 1, 2016.
10. Hemme, T. and Otte, J., ed. (2010). Status and Prospects for Smallholder Milk Production: A Global Perspective (PDF). Food and Agriculture Organization of the United Nations.
11. Uruakpa, F. O.; Ismond, M. A. H.; Akobundu, E. N. T. (2002). "Colostrum and its benefits: A review". Nutrition Research 22 (6): 755–767. doi:10.1016/S0271-5317(02)00373-1.
12. Blood DC, Studdert VP, Gay CC. (2007). Saunders Comprehensive Veterinary Dictionary. St. Louis, Missouri, USA: Saunders Elsevier. ISBN 0-7020-2789-8.
13. The World Health Organization's infant feeding recommendation WHO, based on "Global strategy on infant and young child feeding" (2002). Retrieved February 8, 2013.
14. Katherine A. Dettwyler: When to Wean (Paywall, Questia) Natural History, October 1997. Retrieved February 8, 2013.
15. Basnet, S.; Schneider, M.; Gazit, A.; Mander, G.; Doctor, A. (April 2010). "Fresh Goat's Milk for Infants: Myths and Realities—A Review". Pediatrics 125 (4): e973–977. doi:10.1542/peds.2009-1906. PMID 20231186.
16. Curry, Andrew (July 31, 2013). "Archaeology: The milk revolution". Nature 500 (7460): 20–22. doi:10.1038/500020a. PMID 23903732.
17. "Nutrition for Everyone: Basics: Saturated Fat - DNPAO - CDC". cdc.gov.
18. "Eat less saturated fat". www.nhs.uk.
19. McGee, Harold (2004) [1984]. "Milk and Dairy Products". On Food and Cooking: The Science and Lore of the Kitchen (2nd ed.). New York: Scribner. pp. 7–67. ISBN 978-0-684-80001-1.
20. "World's No 1 Milk Producer". Indiadairy.com. Retrieved August 28, 2010.
21. Goff, Douglas. "Introduction to Dairy Science and Technology: Milk History, Consumption, Production, and Composition: World-wide Milk Consumption and Production". Dairy Science and Technology. University of Guelph. Retrieved November 12, 2014.
22. Gussekloo, S.W.S. (2006). "Chapter 2: Feeding Structures in Birds". In Bels, V. Feeding in Domestic Vertebrates: From Structure to Behaviour. CABI Publishing. p. 22. ISBN 978-1-84593-063-9. A remarkable adaptation can be found in the crop of pigeons. During the breeding season the crop produces a yellow-white fat-rich secretion known as crop milk that is used to feed the nestlings. … The crop milk resembles strongly the milk produced by mammals, except for the fact that carbohydrates and calcium are missing in crop milk.
23. Olivia Solon (October 30, 2014). "Cow-less milk is grown in the lab to taste exactly like the real thing". mirror.
24. "Muufri to Make Artificial Milk From a Lab to Help People, Cows and the Environment". TakePart.
25. Oftedal, Olav T. (2002). "The mammary gland and its origin during synapsid evolution". Journal of Mammary Gland Biology and Neoplasia 7 (3): 225–252. doi:10.1023/A:1022896515287. PMID 12751889.
26. Oftedal, Olav T. (2002). "The origin of lactation as a water source for parchment-shelled eggs". Journal of Mammary Gland Biology and Neoplasia 7 (3): 253–66. doi:10.1023/A:1022848632125. PMID 12751890.
27. "Lactating on Eggs". Nationalzoo.si.edu. July 14, 2003. Archived from the original on April 14, 2009. Retrieved March 8, 2009.
28. Lefèvre C.M., Sharp J.A., Nicholas K.R. (2010). "Evolution of lactation: ancient origin and extreme adaptations of the lactation system". Annual Review of Genomics and Human Genetics 11 (1): 219–238. doi:10.1146/annurev-genom-082509-141806. PMID 20565255.
29. Vorbach C., Capecchi M.R., Penninger J.M. (2006). "Evolution of the mammary gland from the innate immune system?". BioEssays 28 (6): 606–616. doi:10.1002/bies.20423. PMID 16700061.
30. Goldman A.S. (2002). "Evolution of the mammary gland defense system and the ontogeny of the immune system" (PDF). Journal of Mammary Gland Biology and Neoplasia 7 (3): 277–289. doi:10.1023/A:1022852700266. PMID 12751892.
31. referring to the Neolithic period in Eurasian prehistory
32. Bellwood, Peter (2005). "The Beginnings of Agriculture in Southwest Asia". First Farmers: the origins of agricultural societies. Malden, MA: Blackwell Publushing. pp. 44–68. ISBN 978-0-631-20566-1.
33. Bellwood, Peter (2005). "Early Agriculture in the Americas". First Farmers: the origins of agricultural societies. Malden, MA: Blackwell Publushing. pp. 146–179. ISBN 978-0-631-20566-1.
34. Beja-Pereira, A.; Caramelli, D.; Lalueza-Fox, C.; Vernesi, C.; Ferrand, N.; Casoli, A.; Goyache, F.; Royo, L. J.; Conti, S.; Lari, M.; Martini, A.; Ouragh, L.; Magid, A.; Atash, A.; Zsolnai, A.; Boscato, P.; Triantaphylidis, C.; Ploumi, K.; Sineo, L.; Mallegni, F.; Taberlet, P.; Erhardt, G.; Sampietro, L.; Bertranpetit, J.; Barbujani, G.; Luikart, G.; Bertorelle, G. (2006). "The origin of European cattle: Evidence from modern and ancient DNA". Proceedings of the National Academy of Sciences 103 (21): 8113–8118. doi:10.1073/pnas.0509210103. PMC 1472438. PMID 16690747.
35. Avetrani, P.; Avetrani, V.; Bon, G.; Di Carlo, S. E.; Fabi, A.; Nisticò, C.; Vici, P.; Melucci, E.; Buglioni, S.; Perracchio, L.; Sperduti, I.; Rosanò, L.; Sacchi, A.; Mottolese, M.; Falcioni, R. (2008). Jin, Dong-Yan, ed. "Induction of ErbB-3 Expression by α6β4 Integrin Contributes to Tamoxifen Resistance in ERβ1-Negative Breast Carcinomas". PLoS ONE 3 (2): e1592. doi:10.1371/journal.pone.0001592. PMC 2220038. PMID 18270579.
36. Sherratt, Andrew (1981). "Plough and pastoralism: aspects of the secondary products revolution". In Hodder, I.; Isaac, G.; Hammond, N. Pattern of the Past: Studies in honour of David Clarke. Cambridge: Cambridge University Press. pp. 261–305. ISBN 0-521-22763-1.
37. Vigne, D.; Helmer, J.-D. (2007). "Was milk a "secondary product" in the Old World Neolithisation process? Its role in the domestication of cattle, sheep and goats" (PDF). Anthropozoologica 42 (2): 9–40.
38. Evershed, R. P.; Payne, S.; Sherratt, A. G.; Copley, M. S.; Coolidge, J.; Urem-Kotsu, D.; Kotsakis, K.; Ozdoğan, M.; Ozdoğan, A. E.; Nieuwenhuyse, O.; Akkermans, P. M. M. G.; Bailey, D.; Andeescu, R. R.; Campbell, S.; Farid, S.; Hodder, I.; Yalman, N.; Ozbaşaran, M.; Biçakci, E.; Garfinkel, Y.; Levy, T.; Burton, M. M. (2008). "Earliest date for milk use in the Near East and southeastern Europe linked to cattle herding". Nature 455 (7212): 528–531. doi:10.1038/nature07180. PMID 18690215.
39. Price, T. D. (2000). "Europe's first farmers: an introduction". In T. D. Price. Europe's First Farmers. Cambridge: Cambridge University Press. pp. 1–18. ISBN 0-521-66203-6.
40. Meadow, R. H. (1996). "The origins and spread of agriculture and pastoralism in northwestern South Asia". In D. R. Harris. The origins and spread of agriculture and pastoralism in Eurasia. London: UCL Press. pp. 390–412. ISBN 1-85728-538-7.
41. Craig, Oliver E.; John Chapman; Carl Heron; Laura H. Willis; László Bartosiewicz; Gillian Taylor; Alasdair Whittle; Matthew Collins (2005). "Did the first farmers of central and eastern Europe produce dairy foods?". Antiquity 79 (306): 882–894.
42. Copley, M. S.; Berstan, R.; Mukherjee, A. J.; Dudd, S. N.; Straker, V.; Payne, S.; Evershed, R. P. (2005). "Dairying in antiquity. III. Evidence from absorbed lipid residues dating to the British Neolithic". Journal of Archaeological Science 32 (4): 523–546. doi:10.1016/j.jas.2004.08.006.
43. Anthony, D. W. (2007). The Horse, the Wheel, and Language. Princeton, NJ: Princeton University Press. ISBN 978-0-691-05887-0.
44. Gifford-Gonzalez, D. (2004). "Pastoralism and its Consequences". In A. B. Stahl. African archaeology: a critical introduction. Malden, MA: Blackwell Publishing. pp. 187–224. ISBN 978-1-4051-0155-4.
45. Peters, J. (1997). "The dromedary: Ancestry, history of domestication and medical treatment in early historic times". Tierarztliche Praxis. Ausgabe G, Grosstiere/Nutztiere 25 (6): 559–565. PMID 9451759.
46. Pećanac, M.; Janjić, Z.; Komarcević, A.; Pajić, M.; Dobanovacki, D.; Misković, SS. (2013). "Burns treatment in ancient times.". Med Pregl 66 (5-6): 263–7. doi:10.1016/s0264-410x(02)00603-5. PMID 23888738.
47. Valenze, D. M. (2011). "Virtuous White Liquor in the Middle Ages". Milk: a local and global history. New Haven: Yale University Press. p. 34. ISBN 9780300117240.
48. P. J. Atkins (1978). "The Growth of London's Railway Milk Trade, c. 1845-1914". Journal of Transport History.
49. "The History of Milk". DairyCo.
50. "The History Of Milk", About.com. Retrieved August 13, 2010.
51. Vallery-Radot, René (March 1, 2003). Life of Pasteur 1928. pp. 113–114. ISBN 978-0-7661-4352-4.
52. Carlisle, Rodney (2004). Scientific American Inventions and Discoveries, p.357. John Wiley & Songs, Inc., new Jersey. ISBN 0-471-24410-4.
53. Peter Atkins. "The pasteurization of England: the science, cultureand health implications of food processing, 1900-1950".
54. Hwang, Andy; Huang, Lihan (January 31, 2009). Ready-to-Eat Foods: Microbial Concerns and Control Measures. CRC Press. p. 88. ISBN 978-1-4200-6862-7. Retrieved April 19, 2011.
55. Gerosa and Skoet (2012). "Milk availability – Trends in production and demand and medium-term outlook" (PDF). FAO, United Nations.
56. Why Bank Milk? Human Milk Banking Association of North America
57. "Moose milk makes for unusual cheese". The Globe and Mail. June 26, 2004. Archived from the original on September 30, 2007. Retrieved August 27, 2007.
58. "About Bison: Frequently Asked Questions". National Bison Association. Retrieved August 16, 2009.
59. Allen, Joel Asaph (June 1877). "Part II., Chapter 4. Domestication of the Buffalo". In Elliott Coues, Secretary of the Survey. History of the American Bison: bison americanus. extracted from the 9th Annual Report of the United States Geological Survey (1875). Washington, DC: Department of the Interior, United States Geological Survey, Government Printing Office. pp. 585–586. OCLC 991639. Retrieved August 16, 2009.
60. O'Connor, George (March–April 1981). "The Basics of Beefalo Raising". Mother Earth News (Ogden Publications) (68). Archived from the original on May 4, 2007. Retrieved February 8, 2011.
61. "Milk, whole fresh cow producers". UN Food & Agriculture Organization. Retrieved April 22, 2016.
62. "Milk, whole fresh sheep producers". UN Food & Agriculture Organization. Retrieved April 22, 2016.
63. "Milk, whole fresh goat producers". UN Food & Agriculture Organization. Retrieved April 22, 2016.
64. "Milk, whole fresh buffalo producers". UN Food & Agriculture Organization. Retrieved April 22, 2016.
65. "Dairy production and products: Milk production". www.fao.org. Retrieved December 3, 2015.
66. "Milk and milk product statistics - Statistics Explained". ec.europa.eu. Retrieved December 3, 2015.
67. Henriksen, J. (2009) "Milk for Health and Wealth". FAO Diversification Booklet Series 6, Rome
68. Sinha, O.P. (2007) Agro-industries characterization and appraisal: Dairy in India, FAO, Rome
69. "ICAR - International Committee for Animal Recording". icar.org.
70. FAOSTAT, Yield data 2010 – Cow milk, whole, fresh, FAOSTAT, Food And Agricultural Organization of the United Nations; faostat.fao.org; Retrieved on August 1, 2012.
71. Wayne Arnold, "A Thirst for Milk Bred by New Wealth Sends Prices Soaring", The New York Times September 4, 2007.
72. Bewley, Elizabeth (June 24, 2010). "Dairy farmers tackle big coops". Burlington, Vermont: Burlington Free Press. pp. 8B.
73. Wisconsin administrative code for Agriculture, Trade, and Consumer Protection, Chapter ATCP 60. (PDF) . Retrieved on November 24, 2011.
74. Rolf Jost "Milk and Dairy Products" Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2002. doi:10.1002/14356007.a16_589.pub3
75. Fox, P. F. Advanced Dairy Chemistry, Vol. 3: Lactose, Water, Salts and Vitamins. 2nd ed. Chapman and Hall: New York, 1995.
76. Fox, P.F. Advanced Dairy Chemistry: Vol 2 Lipids. 2nd Ed. Chapman and Hall: New York, 1995.
77. Goff, Douglas (2010). "Dairy Chemistry and Physics". Dairy Science and Technology. University of Guelph. Retrieved February 8, 2011.
78. chemistry and physics. Foodsci.uoguelph.ca. Retrieved on December 9, 2011.
79. Wilson, G. S. (1943). "The Pasteurization of Milk". British Medical Journal 1 (4286): 261–2. doi:10.1136/bmj.1.4286.261. PMC 2282302. PMID 20784713.
80. Goff, Douglas (2010). "Homogenization of Milk and Milk Products". Dairy Science and Technology. University of Guelph. Retrieved February 8, 2011.
81. "Research Can Lead To Longer Shelf Life For Dairy Products". Sciencedaily.com. December 23, 2002. Retrieved August 28, 2010.
82. "Milk contains traces of ash". Chennai, India: Hindu.com. July 10, 2008. Retrieved August 28, 2010.
83. "Milk From Cows and Other Animals, web page by Washington Dairy Products Commission". Havemilk.com. Retrieved August 28, 2010.
84. Whale. Encarta.
85. "Milk analysis". North Wales Buffalo. Archived from the original on September 29, 2007. Retrieved August 3, 2009. (Citing McCane, Widdowson, Scherz, Kloos, International Laboratory Services.)
86. USDA National Nutrient Database for Standard Reference. Ars.usda.gov. Retrieved on November 24, 2011. Archived July 7, 2015, at the Wayback Machine.
87. Designing Foods: Animal Product Options in the Marketplace. National Academies Press. 1988. ISBN 978-0-309-03795-2.
88. "National Nutrient Database for Standard Reference Release 28". United States Department of Agriculture: Agricultural Research Service.
89. "Nutrition facts, calories in food, labels, nutritional information and analysis". NutritionData.com.
90. "USDA Table of Nutrient Retention Factors, Release 6" (PDF). USDA. USDA. Dec 2007.
91. "Nutritional Effects of Food Processing". NutritionData.com.
92. Jones, Alicia Noelle (2002). "Density of Milk". The Physics Factbook.
93. Feskanich, D; Willett, WC; Stampfer, MJ; Colditz, GA (1997). "Milk, dietary calcium, and bone fractures in women: a 12-year prospective study". American Journal of Public Health 87 (6): 992–7. doi:10.2105/AJPH.87.6.992. PMC 1380936. PMID 9224182.
94. Brody T. (1999) "Calcium and phosphate". pp. 761–94 in Nutritional biochemistry, 2nd ed. Boston: Academic Press, ISBN 0121348369.
95. Heaney, Robert P.; Weaver, Connie M. (1990). "Calcium absorption from kale". The American Journal of Clinical Nutrition 51 (4): 656–7. PMID 2321572.
96. "Calcium and Milk: What's Best for Your Bones and Health?". The Nutrition Source. Harvard School of Public Health. 2011. Retrieved February 8, 2011.
97. Bonjour JP (2013). "Nutritional disturbance in acid-base balance and osteoporosis: a hypothesis that disregards the essential homeostatic role of the kidney". The British Journal of Nutrition 110 (7): 1168–77. doi:10.1017/S0007114513000962. PMC 3828631. PMID 23551968.
98. Fenton TR, Lyon AW (2011). "Milk and acid-base balance: proposed hypothesis versus scientific evidence". Journal of the American College of Nutrition 30 (5 Suppl 1): 471S–5S. PMID 22081694.
99. Fenton TR, Lyon AW, Eliasziw M, Tough SC, Hanley DA (2009). "Meta-analysis of the effect of the acid-ash hypothesis of osteoporosis on calcium balance". Journal of Bone and Mineral Research 24 (11): 1835–40. doi:10.1359/jbmr.090515. PMID 19419322.
100. Dietary Guidelines for Americans 2010, p. 38, U.S. Department of Agriculture, U.S. Department of Health and Human Services, December 2010.
101. Kotz, Deborah (July 8, 2013) How much milk do we really need?. Boston Globe.
102. Roy BD (2008). "Milk: the new sports drink? A Review". J Int Soc Sports Nutr 5 (1): 15. doi:10.1186/1550-2783-5-15. PMC 2569005. PMID 18831752.
103. Whigham, LD; Watras, AC; Schoeller, DA (May 2007). "Efficacy of conjugated linoleic acid for reducing fat mass: a meta-analysis in humans.". The American Journal of Clinical Nutrition 85 (5): 1203–11. PMID 17490954.
104. Bischoff-Ferrari HA, Dawson-Hughes B, Baron JA, Kanis JA, Orav EJ, Staehelin HB, Kiel DP, Burckhardt P, Henschkowski J, Spiegelman D, Li R, Wong JB, Feskanich D, Willett WC (2011). "Milk intake and risk of hip fracture in men and women: a meta-analysis of prospective cohort studies". Journal of Bone and Mineral Research 26 (4): 833–9. doi:10.1002/jbmr.279. PMID 20949604.
105. "Listeria (Listeriosis)". Centers for Disease Control and Prevention. October 22, 2015. Retrieved December 23, 2015.
106. Babu, J.; Kumar, S.; Babu, P.; Prasad, J. H.; Ghoshal, U. C. (2009). "Frequency of lactose malabsorption among healthy southern and northern Indian populations by genetic analysis and lactose hydrogen breath and tolerance tests". American Journal of Clinical Nutrition 91 (1): 140–146. doi:10.3945/ajcn.2009.27946. PMID 19889824.
107. University of Maryland Medical Center. "Digestive Disorders – Lactose Intolerance". Archived from the original on July 7, 2005. Retrieved May 3, 2009.
108. Patterson, K. D. "Lactose Tolerance", The Cambridge World History of Food, Kiple, K.F. (Ed.) Cambridge University Press, 2000
109. "Can a Lactose Intolerant Eat Some Yogurt & Aged Cheese?". Healthy Eating - SF Gate.
110. Høst A (1994). "Cow's milk protein allergy and intolerance in infancy. Some clinical, epidemiological and immunological aspects". Pediatric Allergy and Immunology 5 (5 Suppl): 1–36. doi:10.1111/j.1399-3038.1994.tb00352.x. PMID 7704117.
111. Melnik BC, John SM, Schmitz G (2013). "Milk is not just food but most likely a genetic transfection system activating mTORC1 signaling for postnatal growth". Nutrition Journal 12: 103. doi:10.1186/1475-2891-12-103. PMC 3725179. PMID 23883112.
112. Wiley, AS (March 2012). "Cow milk consumption, insulin-like growth factor-I, and human biology: a life history approach.". American Journal of Human Biology (Wiley Periodicals) 24 (2): 130–138. doi:10.1002/ajhb.22201. PMID 22121110.
113. Reichelt KL, Knivsberg A-M, Lind G, Nødland M (1991). "Probable etiology and possible treatment of childhood autism". Brain Dysfunct 4: 308–19.
114. Christison GW, Ivany K (2006). "Elimination diets in autism spectrum disorders: any wheat amidst the chaff?". J Dev Behav Pediatr 27 (2 Suppl 2): S162–71. doi:10.1097/00004703-200604002-00015. PMID 16685183.
115. "Gluten-free and casein-free diets in the treatment of autism spectrum disorders: A systematic review". Research in Autism Spectrum Disorders 4: 328–339. doi:10.1016/j.rasd.2009.10.008.
116. Chen, H.; O'Reilly, E.; McCullough, M. L.; Rodriguez, C.; Schwarzschild, M. A.; Calle, E. E.; Thun, M. J.; Ascherio, A. (2007). "Consumption of Dairy Products and Risk of Parkinson's Disease". American Journal of Epidemiology 165 (9): 998–1006. doi:10.1093/aje/kwk089. PMC 2232901. PMID 17272289.
117. "Milk linked to Parkinson's risk". BBC News. April 7, 2005. Retrieved April 10, 2010.
118. World Cancer Research Fund / American Institute for Cancer Research. (2007). Food, Nutrition, Physical Activity, and the Prevention of Cancer: a Global Perspective. Washington DC: American Institute for Cancer Research. ISBN 978-0-9722522-2-5.
119. Giovannucci E; Rimm EB; Wolk A; Ascherio, A; Stampfer, MJ; Colditz, GA; Willett, WC (1998). "Calcium and fructose intake in relation to risk of prostate cancer". Cancer Research 58 (3): 442–7. PMID 9458087.
120. Chan JM, Stampfer MJ, Ma J, Gann PH, Gaziano JM, Giovannucci EL (2001). "Dairy products, calcium, and prostate cancer risk in the Physicians' Health Study". The American Journal of Clinical Nutrition 74 (4): 549–54. PMID 11566656.
121. Chan JM; Gann, PH; Giovannucci, EL (2005). "Role of diet in prostate cancer development and progression". J Clin Oncol 23 (32): 8152–60. doi:10.1200/JCO.2005.03.1492. PMID 16278466.
122. "How Bacteria In Cows' (sic) Milk May Cause Crohn's Disease". Sciencedaily.com. December 13, 2007. Retrieved August 28, 2010.
123. Kubota, A; Kawahara, H; Okuyama, H; Shimizu, Y; Nakacho, M; Ida, S; Nakayama, M; Okada, A (2006). "Cow's milk protein allergy presenting with Hirschsprung's disease–mimicking symptoms". Journal of Pediatric Surgery 41 (12): 2056–8. doi:10.1016/j.jpedsurg.2006.08.031. PMID 17161204.
124. Triolo, G; Accardo-Palumbo, A; Dieli, F; Ciccia, F; Ferrante, A; Giardina, E; Licata, G (2002). "Humoral and cell mediated immune response to cow's milk proteins in Behçet's disease". Annals of the Rheumatic Diseases 61 (5): 459–62. doi:10.1136/ard.61.5.459. PMC 1754076. PMID 11959773.
125. Severson, Kim (August 24, 2010). "A School Fight Over Chocolate Milk". The New York Times.
126. Report on the Food and Drug Administration's Review of the Safety of Recombinant Bovine Somatotropin. Fda.gov. Retrieved on November 24, 2011.
127. Institute of Food Science & Technology (September 1, 1999). "Bovine somatotropin (bST)". Monsanto. Archived from the original on November 26, 2007. Retrieved January 16, 2008.
128. "Monsanto's Bovine Growth Hormone (rBGH) Once Again Under Fire". Organicconsumers.org. June 9, 2006.
129. Voluntary Labeling of Milk and Milk Products From Cows That Have Not Been Treated With Recombinant Bovine Somatotropin. Fda.gov. Retrieved on November 24, 2011.
130. Epstein, Samuel S. "Milk: America's Health Problem". Cancer Prevention Coalition. Archived from the original on March 14, 2010. Retrieved August 28, 2010.
131. "Mastitis Control Programs: Milk Quality Evaluation Tools for Dairy Farmers". Ag.ndsu.edu. January 1, 1997. Retrieved August 28, 2010.
132. Greger, Michael (January 2001). "Paratuberculosis and Crohn's Disease: Got Milk?" (PDF). Vegan Outreach. Retrieved February 8, 2011.
133. "European Council Decision of December 17, 1999". Eur-lex.europa.eu. Retrieved August 28, 2010.
134. People for the Ethical Treatment of Animals. "Milk Sucks". Retrieved December 9, 2009.
135. United States. Office of Dietary Supplements. Dietary Supplement Fact Sheet: Calcium. 2013. Web. <http://ods.od.nih.gov/factsheets/Calcium-HealthProfessional/>.
136. Feskanich, D.; Willett, WC; Stampfer, MJ; Colditz, GA (1997). "Milk, dietary calcium, and bone fractures in women: a 12-year prospective study". American Journal of Public Health 87 (6): 992–997. doi:10.2105/ajph.87.6.992.
137. Carroll, Aaron E. (November 17, 2014). "Got Milk? Might Not Be Doing You Much Good". New York Times. Retrieved November 19, 2014.
138. Michaëlsson K., et. al. (2014), "Milk intake and risk of mortality and fractures in women and men: cohort studies" The BMJ 2014;349:g6015
139. Mekonnen, Mesfin M.; Hoekstra, Arjen Y. (January 24, 2012). "A Global Assessment of the Water Footprint of Farm Animal Products". Ecosystems 15 (3): 401–415. doi:10.1007/s10021-011-9517-8. ISSN 1432-9840.
140. Sahi, T (1974). "Lactose malabsorption in Finnish-speaking and Swedish-speaking populations in Finland". Scandinavian journal of gastroenterology 9 (3): 303–8. PMID 4852638.
141. Zero Lactose – Enfin une solution pour les intolérants au lactose. Zerolactose.be. Retrieved on November 24, 2011.
142. Lactose Free Milk. Real Goodness. Retrieved on November 24, 2011.
143. "Yogurt and Other Cultured Dairy Products", National Dairy Council, 2000.
144. Rombauer, Irma S. and Marion Rombauer Becker (1975). The Joy of Cooking (Revised Edition). Bobbs Merrill. p. 533. ISBN 0-672-51831-7.
145. "How to Buy Dairy Products", Home and Garden Bulletin 255, USDA, February 1995. Retrieved May 16, 2007.
146. Main, Emily (November 30, 2009). "Chocolate Milk Debate Rages On". Rodale News. Retrieved August 28, 2010.
147. Milk and Juice Cartons Fact Sheet, Waste Wise WA, zerowastewa.com.au. Retrieved on June 21, 2009.
148. "Adulterated milk is what Indians are drinking". Centre for Science and Environment. Retrieved June 28, 2015.
149. Coughlan, Sean (March 28, 2006). "Milk's online top-up". BBC News. Retrieved August 28, 2010.
150. "Find me a Milkman – I want doorstep deliveries!". Dairy UK. Retrieved February 8, 2011.
151. ""Milk product roadmaps", The Department for Environment, Food and Rural Affairs". Defra.gov.uk. Retrieved August 28, 2010.
152. Rosenbloom, Stephanie (June 30, 2008). "Solution, or Mess? A Milk Jug for a Green Earth". The New York Times.
153. Yiu H. Hui (2006). Handbook of Food Science, Technology, and Engineering, Volume 2. CRC Press. ISBN 9780849398483. Page 58
154. Crawford et al., part B, section III, ch. 1: Butter. Retrieved November 28, 2005.
155. Green, Jonathon (2005). Cassell's Dictionary of Slang. Weidenfeld & Nicholson. p. 943. ISBN 978-0-304-36636-1.
156. Campbell, Malcolm (September 19, 2003). "Fact Sheet: Milk Fungicide". Australian Broadcasting Corporation. Retrieved April 1, 2009.
157. Hoffelt, Jeffrey (May 25, 2011). "Milk works as fertilizer, says preliminary study". Minnesota Farm Guide. Retrieved June 3, 2015.
158. Phipps, Nikki. "Milk Fertilizer Benefits: Using Milk Fertilizer On Plants". www.gardeningknowhow.com. Retrieved June 3, 2015.
159. "Drop of white the right stuff for vines". Science Daily. September 12, 2002. Retrieved April 1, 2009.
160. Wagner Bettiol, Brenno Domingues Astiarraga and Alfredo José Barreto Luiz. "Effectiveness of cow's milk against zucchini squash powdery mildew (Sphaerotheca fuliginea) in greenhouse conditions". agrar.de. Retrieved June 3, 2015.

Further reading

• Dupuis, E. Melanie. Nature's Perfect Food (2002) excerpt and text search
• Kardashian, Kirk. Milk Money: Cash, Cows, and the Death of the American Dairy Farm (2012) excerpt and text search
• McGee, Harold (2004). On Food and Cooking (2nd ed.). New York: Scribner. ISBN 978-0-684-80001-1.
• Smith-Howard, Kendra. Pure and Modern Milk: An Environmental History Since 1900. Oxford, England: Oxford University Press; 2013.
• Valenze, Deborah. Milk: A Local and Global History (Yale University Press, 2011) 368 pp.
• Wiley, Andrea. Re-imagining Milk: Cultural and Biological Perspectives (Routledge 2010) (Series for Creative Teaching and Learning in Anthropology) excerpt and text search
• United States. Office of Dietary Supplements. Dietary Supplement Fact Sheet: Calcium. 2013. Web. <http://ods.od.nih.gov/factsheets/Calcium-HealthProfessional/>.
• Feskanich, D.; Willett, WC; Stampfer, MJ; Colditz, GA (1997). "Milk, dietary calcium, and bone fractures in women: a 12-year prospective study". American Journal of Public Health 87 (6): 992–997. doi:10.2105/ajph.87.6.992.

External links

• Milk at DMOZ
• Virtual Museum Exhibit on Milk, Cream & Butter
• Carroll, Aaron E. (November 17, 2014). "Got Milk? Might Not Be Doing You Much Good". The New York Times. Retrieved November 18, 2014.