Corn grain is a major cereal grain used to supply energy in livestock diets. Considered the gold standard for cereal grains, corn grain offers a palatable energy source that is low in fiber. It contains no major antinutritional factors and can be fed with minimal processing. Ruminants efficiently consume whole, lightly cracked, rolled, or steam-flaked corn, while poultry consume corn that is rolled to a ground size of 600-900. Corn grain also works in some aquaculture and companion animal diets.