A cow can only give milk after she has a baby. Cows give about 200,000 glasses of milk in their lives. What a cow eats affects how much milk it gives. Cows eat grass, hay, and clover. Cows drink over 20 gallons of water every day.
Cows spit their food up and chew it again.
This is called chewing their cud. They swallow their food more than once. Cows are pregnant for nine months. Only after a cow has a baby can it can give milk. The most common breed of dairy cows is Holsteins.