Choline is one kind of vitamin It is the main element of lecithin. It is of great importance for the growth, breeding and nutriting of fowls ang livestock. Because young fowls and livestock lack the function of synthesizing choline by themselves, the required choline is all from feed supply. Though choline exists widely in most natural foods, the choline content can not meet the demand for animals growth. Thus, it is necessary to add choline in the feed to ensure their rapid and healthy growth. Choline chloride can help to improve the physiological fuction of the resynthesis and transformation of amino acid. It has functions of preventing pathological changes and the accumulation of fat in livers and kidneys. Thus it can improve the physique, premonition and growth rate of fowls and livestock it can also improve the survival rate of newborn pigs, as well the growth and survival rate of fishes.