The Best What Do Organic Milk Cows Eat References. More than 50 percent of cow feed is actually grass (farmers call it hay and silage). The health of a pasture, from the soil to the grass, impacts a cow’s health and ultimately the quality of the cow’s milk.

Organic regulations result in cows eating more of their natural food: This is the leftover grains from beer production. Dairy cows do eat some grain, which usually makes up.