Dairy farming has been part of agriculture for thousands of years. Historically it has been one part of small, diverse farms. In the last century or so larger farms doing only dairy production have emerged. Large scale dairy farming is only viable where either a large amount of milk is required for production of more durable dairy products such as cheese, butter, etc or there is a substantial market of people with cash to buy milk, but no cows of their own.
Panasonic Lumix DMC-FZ35 Dec. 4th 2010 Rural Southland