Choline (dihydroxyethylamino trimethylammonium chloride 2 - hydroxyethyl-trimethyl ammonium hydroxide), usually classified as a vitamin B complex group (usually that vitamin B4).The animal physiology of the body to maintain the necessary low-molecular-weight organic compounds, can be synthesized in vivo animal, but often need to add in the feed, the feed is added to the monomer of the largest vitamin. It can be regulated in vivo metabolism of fat and transformation, and in the prevention of liver and kidney fat deposition and tissue degeneration, and promote the re-formation of amino acids and improve the utilization of amino acid, methonine some savings.