甜菜碱调控蛋鸡脂肪代谢的机理研究

 对甜菜碱影响产蛋鸡脂肪代谢的机理研究结果表明 ,日粮中添加 6 0 0mg/kg甜菜碱促产蛋效果最佳 ,全程平均产蛋率比对照组提高了 8.6 7% (P <0 .0 4 ) ,料蛋比下降了 9.0 2 % (P <0 .0 3) ;日粮中添加 6 0 0mg/kg甜菜碱使蛋鸡5 0周龄和 70周龄腹脂率分别下降了 19.6 3% (P <0 .0 2 )和 2 2 .35 % (P <0 .0 2 ) ,肝脂率分别下降了 8.5 2 % (P <0 .0 5 )和16 .2 8% (P <0 .0 1) ;70周龄蛋鸡腹脂中LPL酶活性下降了 4 4 .83% (P <0 .0 1) ,HSL酶活性提高了 5 0 .0 % (P <0 .0 2 ) ,肝脏中NADPH生成酶MDH活性下降了 2 8.74 % (P <0 .0 3) ;甜菜碱使 5 0周龄和 70周龄蛋鸡血清中T3 水平分别提高了4 3.2 9% (P <0 .0 5 )和 4 3.95 % (P <0 .0 2 ) ,T4水平无明显差异 ,70周龄下丘脑和腺垂体中cAMP含量分别提高了 5 9.89%(P <0 .0 1)和 2 4 .0 3% (P <0 .0 5 ) ;甜菜碱使 5 0周龄和 70周龄蛋鸡血清中葡萄糖浓度分别提高了 4 4 .5 0 % (P <0 .0 3)和16 .2 5 % (P <0 .0 5 ) ,磷脂浓度提高了 71.6 6 % (P <0 .0 1)和 2 2 .4 2 % (P <0 .0 1) ,游离脂肪酸水平提高了 19.6 6 % (P <0 .0 3)和 2 2 .5 1% (P <0 .0 3)。

Effect of Betaine on the Regulation of the Lipid Metabolism in Laying Hen

The experiment was conducted to investigate the effects of betaine on lipid metabolism of laying hens. Results indicated that supplementation of 600 mg/kg betaine significantly improved egg production, and increased egg production by 8.67 %(P<0.04),decreased feed/egg ratio by 9.02 %(P<0.03) compared with control, but egg weight and daily feed intake were no significant difference. It was found that supplementation of 600 mg/kg betaine decreased weights of abdominal fat by 19.63 % (P<0.02) and 22.35%(P<0.02), and decreased liver fat by 8.52%(P<0.05) and 16.28%(P<0.01) in 50 and 70 weeks of age respectively. Compared with control, in 70 weeks of age, activity of LPL in abdominal fat decreased by 44.83%(P<0.01), HSL activity in abdominal fat increased by 50.0%(P<0.02), and MDH activity in liver decreased by 28.74%(P<0.03). Supplementation of 600 mg/kg betaine increased the levels of T 3 by 43.29%(P<0.05) and 43.95% (P<0.02) in 50 and 70 weeks of age respectively, and increased the concentration of cAMP in hypothalamus and anterior pituitary by 59.89% (P<0.01) and 24.03% (P<0.05) respectively in 70 weeks of age The concentration of serum glucose (GLU), FFA and phospholipid increased by 44.50%(P<0.03), 19.66%(P<0.03) and 71.66%(P<0.01) in 50 weeks of age. The concentration of serum glucose (GLU), FFA and phospholipid increased by 16.25% (P<0.05), 22.51% (P<0.02) and 22.42%(P<0.01) in 70 weeks of age.