Effects Of Niacinamide And Choline On Growth Performance And Fat Metabolism In Broiler Chickens

480(half of male and female) AVIAN broiler chickens with health and 1 day-old were selected and divided randomly into 16 groups with 3 replicates of 10(half of male and female) chickens each by 4 X 4 (niacinamide X choline chloride). A basal corn-soybean meal diet containing 22.7 and 14.8 mg/kg niacinamide, and containing 770 and 680 mg/kg choline during 0~3 and 3~6 weeks of age was used. The dietary niacinamide additional levels were 30, 70, 110 ,150mg/kg and choline chloride additional levels were 1000, 1300 ,1600 ,1900mg/kg. The experimental period was divided into 3 phases of 1-14, 15-28 and 29-42 day-old. Chickens were given a free choice access to diets and tap water for 6 weeks. Chickens were weighed in 14, 28 and 42 day-old, and it was chosed 2(1 male and 1 female) chickens from each replication to determine cholesterol (CHOL), triglyceride(TG), high density lipoprotein(HDL), low density lipoprotein(LDL), very low density lipoprotein(VLDL) in serum at 14, 28 and 42day-old and to determine abdominal fat ratio, hepatic fat ratio and content of fat in leg muscle at 28 and 42day-old. The results showed that niacinamide supplement had no effect on the growth performance of broiler chickens(P>0.05). However they significantly affect the content of CHOL, TG, HDL, VLDL in serum, abdominal fat ratio, hepatic fat ratio and content of fat in leg muscle(P<0.05). Supplemented on of dietary niacinamide 70 mg/kg caused above-mentioned content to decrease 7.91%, 23.40%, 14.14%, 0.61%, 3.49% and 2.80% respectively at 42day-old. It53also showed that choline chloride supplement had no effect on TG, HDL, LDL and VLDL in serum (P>0.05). However it significantly affected the daily body weight gain, feed efficiency(P<0.05), it was increased 1.56% and 1.52% respectively of 1600 mg/kg choline chloride addition group during 29-42 day-old. And it significantly affected CHOL in serum, abdominal fat ratio and hepatic fat ratio(P<0.05), Supplemented on of dietary choline chloride 1600 mg/kg caused above-mentioned content to decrease 7.91%, 0.29% and 3.49% respectively at 42 day-old. There was medium degree negative correlation between niacinamide levels of diet and abdominal fat ratio, hepatic fat ratio, content of fat in leg muscle, CHOL and HDL in serum. The correlative coefficient of the above-mentioned is -0.567, -0.525, -0.532 and -0.313 respectively. Parallelly, there was week degree negative correlation between choline and above-mentioned factors. The correlative coefficient of above-mentioned is -0.169, -0.096, -0.079 and -0.152 respectively. There was not obvious synergistic action between niacinamide and choline chloride. Optimal additive level of niacinamide and choline chloride were 70mg/kg and 1600mg/kg in diet of broiler chickens respectively.