日粮蛋白质水平对奶牛产后卵巢机能恢复及生殖激素的影响

[目的]本试验旨在探讨不同蛋白质水平日粮对奶牛产后卵巢机能恢复及生殖激素的影响,以确定奶牛日粮适宜蛋白质水平.[方法]采用单因素对比实验设计,根据生理状况和泌乳性能相近原则将72头中国荷斯坦牛,随机分成3组,每组24头,分别在围产期和泌乳盛期饲喂9.8%(A1)和13.8%(A2)、12.6%(B1)和16.2%(B2...

Effect of Dietary Protein Level on Restoration of Ovarian Function and Reproductive Hormones after Delivery of Dairy Cow

【Objective】The experiment was conducted to study the effects of different protein levels of ration compound on the restoration of ovarian function and reproductive hormones to determine the appropriate protein levels of dairy cows’ diet.【Method】According the similar principle of the physiological status and lactation performance,comparison of single factor experiment was designed.72 Chinese Holstein were randomly divided into 3 groups,and there were 24 in each group.Different protein levels diet was fed 9.8%(A1) and 13.8%(A2),12.6%(B1)and 16.2%(B2),14.1%(C1) and 17.8%(C2),that is A group(A1,A2),B group(B1,B2)and C group(C1,C2)in perinatal and peak lactation,respectively.【Result】The concentration of P4 in plasma of B and C group was significantly lower than A group(P<0.05)on the 5th day,10th day and 15th day after delivery,and the concentration of LH and E2 in plasma of B and C group was significantly higher than that of A group(P<0.05)on 10th day and 15th day after delivery;the concentration of P4 in plasma of A and B group was higher than that of C group(P<0.05)on the 15th and 20th day of estrous cycle,and the concentration of E2 in plasma of B group was higher than C group(P<0.05)on the 20th day of estrous cycle.【Conclusion】Respectively being fed protein levels diet 12.6% and 16.2% in perinatal and peak lactation,so that dairy cow could resume ovarian function as early as possible and the reproductive hormone of organism was good to the metabolic coordination after delivery,and dairy cow could play its reproductive performance better.