The livestock sector plays a vital role in the economies of many developing countries. It provides food, or more specifically animal protein in human diets, income, employment and possibly foreign exchange. For low income producers, livestock also serve as a store of wealth; provide drought power and organic fertilizer for crop production and a means of transport. The importance of milk and milk products in human diet cannot be over-emphasized in a country like India, where milk is the only source of animal protein for the predominant vegetarian population. It provides the primary source of nutrition for young mammals before they are able to digest other types of food. The early lactation milk is known as colostrum, and carries the mother's antibodies to the baby. It can reduce the risk of many diseases in the baby. The exact components of raw milk vary by species, but it contains significant amounts of fat, protein and calcium. In 2001 India became the world leader in milk production with a production volume of 84 million tons, followed closely by the USA and by 2020 production will increase to 199 million tons.