Vitamin B6 (including pyridoxine, pyridoxal, pyridoxamine, and other forms) is a key water-soluble vitamin in animal feed. Serving as a coenzyme for over 100 enzymes in the body (especially transaminases, decarboxylases, etc.), it plays a central role in the metabolism, conversion, and synthesis of proteins and amino acids, and is crucial for the efficient utilization of nitrogen. In animal production, Vitamin B6 significantly promotes the absorption and deposition of dietary protein, enhancing growth rate and lean meat percentage; it maintains healthy nervous system function (by participating in neurotransmitter synthesis) and immune responses (by supporting antibody production); and it helps prevent nutritional anemia (by participating in heme synthesis). Deficiency can lead to multiple metabolic disorders, with typical symptoms including growth retardation, abnormal excitability, convulsions, and anemia in poultry; reduced appetite, rough hair coat, locomotor ataxia, and decreased reproductive performance in pigs; and growth impairment in young ruminants. Since animals synthesize it in very small amounts, and the requirement increases under high-protein diets, stress, or rapid growth conditions, adequate supplementation in complete feed is essential.