季节和体重对肉用绵羊超数排卵的影响

Effect of Season and Body Weight on Superovulation in Mutton Sheep

本试验选择64只(次)健康经产的德国美利奴、无角道赛特、特克塞尔肉用绵羊,集中饲养,分别在秋季、冬季和春季,根据体重分组进行超数排卵,即41～50 kg组、51～60 kg组、61～70 kg组和71～80kg组。结果表明,不同品种超数排卵的结果无显著差异(P>0.05)。不同季节对肉用绵羊超数排卵影响差异不显著(P>0.05),但胚胎可用率秋季和冬季高于春季(P<0.01)。不同体重组对肉用绵羊超数排卵反应亦没有影响(P>0.05),但41～50 kg组和51～60 kg组的可用胚数高于71～80 kg组(P<0.05),胚胎可用率41～50 kg组高于其它组(P<0.01),51～60 kg组的胚胎可用率高于71～80 kg组(P<0.01),61～70 kg组的胚胎可用率高于71～80 kg组(P<0.05)。本试验结果说明肉用绵羊在秋冬春季超数排卵效果差异不明显,可在这些季节进行胚胎生产和移植。体重在41～70 kg的供体母羊进行超排效果较好。

64 healthy Mutton Sheep were selected and fed in same location. According to body weight of sheep 41-50 kg,51-60 kg,61-70 kg and 71-80 kg in Autumn ,Winter and Spring 4 groups were allotted randomly for superovulation treatment. The results indicated that there were no significant difference （P〉0.05） between the breeds. There was no significant （P〉0.05） effect on different seasons in superovulation of mutton sheep, but the rate of useable embryos in Autumn and Winter were higher than that in Spring （P〈0.01）. There was also no significant （P〉0.05） difference on body weight of superovulation of mutton sheep. However, the useable embryos with 41-50 kg and 51- 60 kg were higher than that of 71-80 kg （P〈0.05）, the rate of useable embryos with 41-50 kg was higher than that of 51-60 kg ,61-70 kg and 71-80 kg （P〈0.01）; the rate of useable embryos with 61-70 kg was higher than that of 71- 80 kg （P〈0.05）. The experiment results suggested that breeding season of mutton sheep were no affect on sheep embryos production and transplantation in these season. Donor sheep of body weight with 41-70 kg were better than other groups for superovulation treatment.