季节和激素剂量对鲁西黄牛超数排卵的影响

通过检疫，选择3～5岁健康鲁西黄牛190头，集中饲养，分别在春、秋、冬三个不同季节，按照鲁西黄牛体重随机分为三种不同剂量，即0．010～0．012mg／kg体重，0．013～0．014mg／kg体重和0．015～0．016mg／kg体重进行超数排卵。结果表明，不同季节对鲁西黄牛超数排卵影响差异不显著（P〉0．05），但胚胎可用率冬季高于春、秋两季（P〈0．01）。激素不同剂量对鲁西黄牛超数排卵亦没有影响（P〉0．05），但0．013～0．014mg／kg体重、0．015～0．016mg／kg体重超排有效头数都高于0．010～0．012mg／kg体重（P〈0．01）；0．013～0．014mg／kg体重胚胎可用率高于0．015～0．016mg／kg体重（P〈0．05）和0．010～0．012mg／kg体重（P〈0．01）。

Effect of Season and Hormone Dosage on Superovulation of Luxi Yellow Cattle

One hundred ninety healthy quarantined Luxi Yellow cattle of 3~5 year-old were selected and fed in same location.Three different dosages,namely 0.010~0.012mg/kg,0.013~0.014 mg/kg and 0.015~0.016 mg/kg according to body weight of cows in Spring,Autumn and Winter were allotted randomly to superovulate.The results indicated that there was no significant(P>0.05) effect of different seasons on superovulation of Luxi Yellow cattle,but the rate of available embryos in Winter was higher than that in Spring and Autumn(P<0.01).There was also no significant effect of different dosages on superovulation of Luxi Yellow cattle(P>0.05).However,the available number of superovulating cows with 0.013~0.014 mg/kg and 0.015~0.016 mg/kg were higher than that of 0.010~0.012 mg/kg(P<0.01);and the rate of available embryos of 0.013~0.014 mg/kg was higher than that of 0.015~0.016 mg/kg(P<0.05) and 0.010~0.012 mg/kg(P<0.01).