A section of animal agriculture concerned with the production of milk and milk products. The mammary gland in mammals was developed for the nourishment of their young. Over the centuries humans have selected some mammals, especially the cow, goat, and water buffalo, for their ability to produce quantities of milk in excess of the requirements of their young. At the same time humans have improved the management and nutrition of the animals so that they can produce milk more efficiently. The production of milk includes selection of animals, breeding, raising young stock, feed production, nutrition, housing, milking, milk handling, sanitation, disease control, and disposal of milk, surplus animals, and manure.