Some of the key ingredients in cow nutrition include fresh green grass, whole grains, fiber and clean water. It is important that dairy cows or milking cows are fed a balanced and nutritionally wholesome diet throughout the year in order to ensure superior milk production.ome of the key ingredients in cow nutrition include fresh green grass, whole grains, fiber and clean water. It is important that dairy cows or milking cows are fed a balanced and nutritionally wholesome diet throughout the year in order to ensure superior milk production.