半胱胺对奶牛生产性能及血清激素水平的影响

选择 3 2头泌乳母牛 ,随机分为 4组 ,每组 8头 ,饲养 47d。在各组奶牛精料中按每天每头分别添加 0、2 0、3 0、40g半胱胺添加剂CT -2 0 0 0 ,研究半胱胺对奶牛生产性能及血液激素指标的影响。试验结果表明 :①精料中添加半胱胺显著提高奶牛产奶量5 .0 1% ,降低料奶比 (P <0 .0 5 ) ,对精料采食量无显著影响 (P >0 .0 5 ) ;②添加半胱胺有提高无脂固形物、乳脂与乳糖趋势 ,但差异不显著 (P >0 .0 5 ) ;③添加半胱胺 2 0、3 0、40g可分别显著 (P <0 .0 5 )提高血清胰岛素水平 19.82 %、2 3 .73 %与 3 0 .0 0 % (P <0 .0 1) ,但对血清中T3、T4 有降低趋势 (P >0 .0 5 ) ;④精料中每日每头添加CT -2 0 0 0 2 0g较 3 0、40g剂量对提高奶牛生产性能效果更佳

Effects of Cysteamine on Performance and Serumhormone Levels in Lactating Dairy Cows

In order to study the effects of cysteamine on performance and serum hormone levels in dairy cows, Thirty-two lactating dairy cows were randomly divided into 4 groups (8*!cows per group), The concentrate of each group was supplemented with 0,20,30, and 40*!g/(d·herd) cysteamine additive (CT-2000) fed for 47 days.The results showed:①Addition of cycteamine from CT-2000 increased (P<0.05)milk yield by 5.01% and decreased (P<0.05),concentrate/milk yield ratio, but average daily concentrate intake was not affected by cysteamine (P>0.05). ②Dietary cysteamine supplementation slightly increased contents of non-fat solids, milk fat and lactose in milk (P>0.05).③Dietary cysteamine supplementation increased significantly serum insulin level by 19.82%[20*!g/(d·herd)],23.73%[30*!g/(d·herd)]and 30.00 % [40*!g/(d·herd)] respectively, but slightly decreased (P>0.05) the level of T 3,T 4 in serum.④In this study, the optimum supplemental level of cysteamine additive was 20*!g/(d·herd).