Dairy farming is the practice of raising animals for the purpose of milk and dairy products, although any species of cattle or any other mammal can produce milk. Dairy farming focuses on popular species such as dairy cows, sheep and goats, of which dairy farming is the main stage in dairy farming. Dairy farming is a stage in agricultural farming to produce fresh milk. 

This is impressive work. I am glad the system of milking cows has evolved greatly. Although I must ask, how is it determined how much milk the cow can produce I would assume the total milk within the body would differentiate from a young adult calf compared to a fully fledged adult cow would be vastly different