不同时期添加甜菜碱对肉鸡生产性能及脂肪代谢影响的研究

【作者】 李俊平；

【导师】 王俊东；

【作者基本信息】 山西农业大学 ， 临床兽医学， 2001， 硕士

【摘要】 360只1日龄健康艾维茵（Avian）肉雏鸡随机分为6组，每组60只，分别为对照组和第Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ试验组，试验期7周。第Ⅰ～Ⅴ组分别于不同时期添加同一剂量的甜菜碱（1000mg/kg，0.1％），添加时间依次为1～7周，2～4周，3～5周，4～6周，5～7周。结果表明：不同时期添加甜菜碱均促进了肉鸡体增重，降低了肉鸡腹脂率，与对照组相比，第Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ组7周末体重分别高出8.01％（p＜0.01），5.01％（p＜0.05），4.47％（p＜0.05），2.24％（p＞0.05）和2.09％（p＞0.05）；腹脂率分别降低了19.56％（p＜0.01），6.09％（p＜0.05），13.48％（p＜0.01），15.65％（p＜0.01）和12.17％（p＜0.05）；第Ⅱ组体重曾在第3、4周末超过第Ⅰ组，从6周龄开始，各组间体重差异在逐渐缩小；添加甜菜碱组皮脂厚度，胸、腿肌中甘油三酯含量较对照组不同程度增加（厚），但肝脏中甘油三酯含量各实验组均低于对照组；血清多个生化指标各次采样测定值，组间变化复杂，但其动态变化呈现一定的规律性；其中，血清总蛋白含量较稳定，总氨基酸含量随周龄逐渐升高，甘油三酯5～6周高于1～3周，游离脂肪酸含量随周龄呈下降趋势，血清尿酸呈现缓U型变化曲线。结论：①不同时期添加0.1％甜菜碱可促进肉鸡体增重，降低腹胀率，引起体内脂肪重新分配；前期添加甜菜碱对肉鸡增重效果明显，而后期添加降腹脂作用显著；②甜菜碱具有明显抗脂肪肝作用；③血清部分生化指标的动态变化证明了肉鸡前期生长发育旺盛，后期脂肪沉积较多；④甜菜碱对肉鸡的增重效果短期内明显，最终肉鸡体重差异各组间逐渐变小。更多还原

【Abstract】 Effect of Betai on Broiler Product Performance and Fat Metabolism in Different Stage Abstract 360 broilers, aged 1 day, were allotted to 6 groups randomly and each group included 60 broiler respectively.All groups received the same basal diet. I - V group is the test groups(supplemented with 1000mg/kg betaine respectively in different stage just as F?wk, 2?wk, 3~5wk, 4?wk, 5-?wk),and another group is the control group. The result indicated that betaine groups increased body weight by 8.Ol%(p<O.Ol), 5.01 %(p<O.O5), 4.47%(p<O.05), 2.24%(p>O.OS) and 2.O9%(p>O.O5) respectively while these groups decreased the rate of abdominal fat by 19.5 6%(p<O.0 1 ),6.O9%(p<O.O5), 1 3.48%(p<O.O 1), 1 5.65%(p<O.Ol) and 12.17% (p<O.O5) contrasted with the control group by the end of the experiment. The body weight of group II was once higher than group I at the end of 3wk and 4wk.After 6wk, the difference of body weight between each group decreased gradually with the growth of age; The content of tricylglycerol in muscle of chest and leg in test groups had a rise but it decreased in liver; The change of serum biochemical indexes was regular relatively during the experiment though it was complicated between different groups. These results suggested that: ?Betaine increases the body weight gained but decrease the abdominal fat of broiler, results in the re-allocation of body fat;Jbetaine prevents from the fat liver;etaine increases weight gained significantly by betaine in early period.更多还原