Why Do Cattle Keep Chewing Long After Eating Grass?

Cattle eat grass very quickly, only chewing a few times before swallowing. Later, when they rest, they will regurgitate the grass and chew it carefully. This is because cattle have a specially complex stomach; they have four stomachs: a rumen (or paunch), a reticulum, an omasum, and an abomasum. The rumen is like a temporary storehouse to store the swallowed grass. Then the reticulum ferment and soften the grass and make it into balls. When the cattle are at rest, these grass balls will be coughed up to be chewed thoroughly and then into the omasum and abomasum to be digested.