Milk is a white liquid produced by the mammary glands of mammals.It is the primary source of nutrition for infant mammals (including humans who breastfeed) before they are able to digest other types of food.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 human small intestine after birth and then begins a slow decline unless milk is consumed regularly.Possibly the first such instance was in 1846, when St Thomas's Hospital in Southwark contracted with milk suppliers outside London to ship milk by rail.
Legislation in 1875 made the adulteration of milk illegal - this combined with a marketing campaign to change the image of milk.
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 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.
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. 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.