Concentrates (grains) usually account for 10-40% of the energy obtained from feed in cattle, 40-85% in pigs and 5-25% in sheep and goats. Starch content in grains is approximately 45% in cereals and up to 72% in maize grain. Different sugars make up to 2.5% of the dry mater in grains. The level of raw proteins is limited (10-14%)