Effect of daidzein on milk yield, components of milk and hormones in serum of dairy cows

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 10mg/kg during the treatment stage. Results showed that daidzein lessened the declining tendency of milk yield in late lactation and increased the milk yield to some extents. Lactoprotein was evidently increased （P〈0.01）, while milkfat was not affected evidently. The level of T4 in serum was evidently increased （P〈0.05）; the levels of GH, PRL, E2 and TSH in. serum were prone to rising while T3 was prone to decreasing . It was concluded that daidzein could indirectly affect milk yield and components of milk by regulating the levels of intrinsic hormones.     

红薯渣对奶牛产奶量和奶品质的影响

摘要试验选用;35头健康无病、处于泌乳中期、胎次相同、体重相近（体重约450kg）、产奶量相近（P〉0．05）的荷斯坦奶牛,随机分为2组：对照组10头,用产奶期正常饲料饲喂;试验组25头,每头牛在对照组日粮基础上投5kg新鲜红薯渣替代5kg苜蓿干草。结果表明：在产奶期日粮中添加新鲜红薯渣对奶牛的产奶量没有显著影响（P〉0．05）;从乳成分试验统计数据看,其对奶牛的乳成分影响不明显,乳脂、乳蛋白、乳糖、乳固形物和非脂固形物均无显著差异（P〉0．05）。