+14 How Many Hours Do Cows Eat A Day 2022. • 7 to 10 hours ruminating (while standing and lying) • 30 minutes drinking water. As cows produce more milk, they eat more.

But the rumen is where all the magic happens. According to research by grant and albright, a cow (living in a freestall barn) prefers to spend its day with the following routine: When a cow eats grass, hay, and even corn, she chews it up and swallows it.