uHM........What about goats? Our Nubian gives a gallon a day and eats brush and weeds. Why would you want small cows over a goat? A cow is a very inefficient animal in terms of pounds of feed converted to meat and milk. The only driver for dairying with cows is strictly volume and market acceptance.
I remember my Mother making goats milk gravy and we always had barbecued goat on the fourth of July.
I believe that if more people tried it, it would be more market acceptable.