Milk is the best and most complete of all foods. It is secreted by the animals to serve as sole and wholesome food for their suckling young ones. It is a fine blend of all the nutrients necessary for growth and development of the young ones. The chief protein of milk is Casein - It occurs in combination with Calcium as Calcium Caseinogenate. The other proteins are Lactalbumin and Lactoglobulin. Animal milks contain nearly three times as much protein as human milk.