Effect Of Betaine And Yeast Chromium On Production Perfoumance And Lipic Metabolism In 4～7 Weeks Broiler Chickens

288 AA Broiler Chickens, aged 3 weeks, were randomly allotted to 9 treatments, 32 for each treatment, 8 for each repetition, a 3 3 (chromium Betaine) experiment with repeats was designed to investigate the effects of adding Yeast chromium(0, 400, 600 g/kg respectively) and Betaine (0, 800, 1000mg/kg respectively) to corn soybean diets on production performance and lipid metabolism in broiler chicken's and their interaction. The basal diet was used as control group, and the experiment lasted for four weeks. The result showed:1.Betaine and chromium supplementation significantly increased average daily gain, daily feed intake in the test chickens compared with that in the control group (p<0.01), and significant interaction effects between betaine and chromium (p<0.01). There were no significant interaction effects between betaine and chromium for feed efficiency (p>0.05), althought the data in each test group increased more than that in the control group. Synthesized the above results: the test of 800mg/kg betaine was the best on growth performance in the test.2.there were significant interaction effects between betaine and chromium for slaughter rate, abdomininal fat rate, the rate of the whole pure thorax, relative tibia length, and relative skin fat thickness(p<0.01), and no significant interaction effects for half pure thorax rate(p> 0.05).3.Compared with the control group, the weights and relative weights of spleen and fabricius burse in test groups had significantly increased (p<0.01), and there were interaction effects between betaine and chromium. Synthetically, the test group of adding 800mg/kg betaine and 600 g/kg chromium at the same time was better, and increased significantly relative weights of spleen and fabricius burse at the end of 7 weeks broiler chickens.4. Betaine and chromium for the content of cholesterol (TC) and triglycerides (TG) in liver and muscle of chest and leg have interaction effects (p<0.01). Analyzing the effect, it was better for the test group of adding 1000mg/kg betaine and 400 g/kg chromium at the same time.5. At the end of 7 weeks, betaine and chromium significantly increased the concentrations of serum total protein (TP), albumin (ALB), globulin (GLOB), free fatty acid (FFA), high density bipid protein chloesterol(HDL-C) compared with control group(p<0.01); significantly reduced concentrations of the cholesterol (TC), uric acid(UA), low density bipid protein chloesterol (LDL-C), triglycerides (TG), and glucose(Glu); there were significant interaction effects for the above all serum sample analysis.6. Serum alkaline phosphatese (ALP) and lactic acid dehydrogenase(LDH) activities were irregular, and serum calcium(Ca) and phosphorus(P) levels had no significant effect in 7 weeks old. Those need to further study.7.The chromium residues in muscle were determined to be not exceeding the limitation of national standard. No histological charge was found in the tissues of the tested organs. It is concluded that adding a certain amount of chromium to Broiler chickens diet had a beneficial effect.