Famous What Do Farm Cows Eat Ideas. Dairy farmers feed cows living in barns a mix of feed they call total mixed ration, or tmr. Molasses, beet pulp and soyhulls are purchased from a feed mill.

They are high in fiber and assist in digestion. Rather than being allowed to graze on grass and other vegetation as they would naturally, dairy cows in factory farms are fed a diet high in processed cereal grains such as corn and wheat. The rest of the diet includes feeds such as corn, soybeans, byproduct feeds, vitamins, and minerals.