It is one the vitamins in vitamin B group, and is an important composition of lecithinum, acethlcholine and neurophospholipid in biological tissues; besides, it can save on methionine. Choline is of a great importance for the growth of fowl, livestock, fish and shrimp. It, in animals body, plays a role of adjusting the metabolism and inversion of fat, as well as preventing fat from accumulating on liver, and liver tissue from degenerating. As a donor of methyl, it can promote the formation of amino acids and increase the availability of amino acids. Tests show that choline is especially important to fowl. The amino acids and the lecithinum, composed of choline, are transferred to the tissues of fowls to prevent fat from accumulating on liver and kidney, and to speed up fowls growth and raise hatchability and laying rate. Tests also show that lack of choline affects the growth of a grass carp greatly in the way of lowing content of phospholipid, cholesterol, triglyceride and blood fat in the body of a grass carp. Lack of choline in feed for domestic animals such as marten, pig, rabbit, cattle, etc. can cause them maldeveloped with soft bones, rough fur, low growth rate and high morbidity. Choline chloride, therefore, must be added into the feed to ensure a fast growth of animals. In general, 1kg choline chloride is enough for 1,000kg feed. In case of young animals, dosage should be increased appropriately. The product is sold in two packages, namely, 25kg per bag in paper bag compounded with film, 0.5kg per bag in double-layer plastic bag.