Fat liver is a common disease and always harmful to animal health. As an effective methyl donor,betaine can affect fat and protein metabolism. Although lots of work focused on the fat deposition influenced by betaine in animals body has been published,little information is available about the effect of betaine on lipid metabolism and lipotropy in animal liver. Swine is easy to accumulate fat in organ and tissue especially in the finishing stage(60 90 kg). According to this, 150 pigs(Duroc×Landrace×Yorkshi...