Vitamin B6 (including pyridoxine, pyridoxal, pyridoxamine and other forms) is a critical water-soluble vitamin in animal feed. 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 essential for efficient nitrogen utilization. In livestock production, Vitamin B6 significantly promotes the absorption and deposition of dietary protein, enhancing growth rate and lean meat percentage; maintains healthy nervous system function (by participating in neurotransmitter synthesis) and immune responses (by supporting antibody production); and 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, incoordination, and decreased reproductive performance in pigs; and growth retardation in young ruminants. Since animals synthesize very small amounts on their own, and the requirement increases under high-protein diets, stress, or rapid growth conditions, adequate supplementation in complete feed is essential.