Form of animal husbandry that uses mammals, primarily cows, for the production of milk and products processed from it (including butter, cheese, and ice cream). Though cattle, goats, and sheep have been kept for the production of dairy products since the earliest historical times, modern dairy farming resulted from the technological advances of the past hundred years: the factory system for processing; sterile storage; refrigeration, fast vehicles and paved roads; and pasteurization and the enforcement of food-safety laws. Outstanding dairy breeds include the Holstein, Guernsey, Jersey, Ayrshire, and Brown Swiss