What I know about dairy farming is that is a type of agriculture that involves the long-term production of milk.
I know a lot actually, dairy farming class of agriculture for long-term production of milk.
Do you know anything about dairy farming?
Dairy farming is a class of agriculture for long-term production of milk, which is processed (either on the farm or at a dairy plant, either of which may be called a dairy) for eventual sale of a dairy product.