Corn steep liquor is a by-product of the corn wet-milling industry. CSL is a viscous, slurry liquid feed ingredient with a dark brown color. It is a mixture of soluble proteins, reducing sugarsand natural organic acids (lactic acid) having ensiled ordure with acidic pH. Nutrient composition shows that high protein content makes it excellent protein source for use in poultry diets. Almost all the essential amino acids like lysine and methionine are present in a good proportion.