Corn gluten feed is a by-product of maize grain wet-milling for starch or ethanol production. It is primarily composed of maize bran and steep liquor, and may also contain distillers solubles, germ meal, and cracked maize screenings. Corn gluten feed is a moderately high source of protein (20-25% DM), and is commonly used in ruminant diets.
Its nutritional attributes, including energy and protein content, vary depending on the milling process and the proportion of steep liquor in the blend.
 minerals. It is particularly popular in aquaculture feeds due to its high protein content and excellent amino acid balance for aquatic animals.