Vitamin B6 is a source of pyridoxine hydrochloride. The amount of vitamin B6 is influenced by the percentage of protein in the chick’s diet. Chicks on a high protein level diet require excessive amounts of vitamin B6. Besides the well-known functions of this vitamin in amino acid metabolism, several studies have been conducted on the role of this vitamin in erythropoiesis and lipid metabolism in birds. The activities of several aminotransferases have been shown to be depressed in vitamin B6 deficiency in poultry.