大豆黄酮对奶牛相关产奶性能的影响

选用4头泌乳约7个月的荷斯坦奶牛,采用前后自身对照方法,对照期饲喂常规日粮,试验期日粮中添加10 mg/kg的大豆黄酮,研究大豆黄酮对泌乳后期奶牛泌乳量、乳成分及乳中激素的影响。结果显示,饲喂大豆黄酮能缓解泌乳后期奶牛产奶量下降的趋势,并在一定程度上提高产奶量;乳蛋白含量显著升高(P<0.01),乳脂率变化不大。激素分析结果表明,乳中T4的含量显著升高(P<0.05),GH,PRL,E2和TSH的含量有升高的趋势,而T3则有下降的趋势。提示大豆黄酮可能通过调节内源性激素水平而间接地影响奶牛泌乳量和乳成分。

Effect of Daidzein on Related Lactational Performance of Dairy Cows

Effects of daidzein on the milk yield,components and hormones in milk of cows in late lactation were studied.Four Holstein dairy cows in the 7th month of late lactation were sampled and self-control method was used.Daidzein was added to the concentrated feed at the dose of 10 mg/kg during the treatment stage.The results showed that daidzein could lessen the declining tendency of milk yield in late lactation and increased the milk yield to some extent.Lactoprotein was evidently increased(P<0.01) while butterfat was not evidently affected.The level of T-(4) in milk was evidently increased(P<0.05);the level of GH,PRL,E-(2) and TSH in milk prone to rose while T-(3) prone to decreased.It could be concluded that daidzein could indirectly affect milk yield and components of milk by regulating the levels of intrinsic hormones.