The Best What Do Dairy Cows Eat In Canada References. The majority of british dairy cows eat grass during the summer and silage (preserved grass or maize) in the winter. That is the total intake (kilograms per day) of a cow is the result of the number of meals consumed daily (meals per day) and the size of those meals (kilograms per.

The majority of british dairy cows eat grass during the summer and silage (preserved grass or maize) in the winter. Dairy cows do eat some grain, which usually makes up. The average dairy cow eats about 29 kg of feed every day.