重复超排和热应激对青年荷斯坦奶牛超排效果的影响  

Effect of Repeated Superovulation and Heat Stress on the Superovulation in Heifers

作　　者：段保宁 

机构地区：[1]河北省邯郸市饲料工业办公室,邯郸056002

出　　处：《中国草食动物科学》2013年第3期18-22,共5页China Herbivore Science

摘　　要：试验对比了青年荷斯坦奶牛优秀个体(A组)和较差个体(B组)的重复超排效果。结果表明:A组两次超排的平均获卵数和平均可用胚数均明显低于B组(P<0.05),但两组在平均不可用胚数、平均无精卵数和平均变性胚数上均没有显著差异(P>0.05)。对比不同可用卵率的青年荷斯坦奶牛的重复超排,选择平均可用卵率>60%的奶牛作为C组,平均可用胚率<30%的奶牛作为D组进行比较,结果表明:D组供体奶牛在超排过程中的可用卵率较低,平均获卵数也较低,而C组供体奶牛在重复超排过程中保持较高的可用卵率和平均可用胚数,适合重复超排的进行。对比了7月份、10月份和1月份供体奶牛的超排效果,结果表明:在平均可用卵数上,7月份组明显低于其他两组(P<0.05);在平均无精卵数上,7月份组明显高于其他两组(P<0.05),热应激严重影响奶牛的繁殖机能,从而影响超排效果。In this experiment, the excellent heifers （group A） and bad heifers （group B ） were superovulated repeatedly, the resuits showed that,in the repeated superovulation,the average embryo number and average useable embryo number in group A were less than those in group B （P〈0.05） , but there were no differences at the average non-useable embryo number, the average non-fertilized embryo and the denatured embryo （P〉0.05）. Heifers with different useable embryo rate were superovulated repeatedly, heifers with more than 60% useable embryo rate were named as group C, heifers with less than 30% useable embryo rate were named as group D, the comparison showed that the average embryo number and average useable embryo number in group D were less than those in group C, thus the group C can be superovulated efficiently. Comparing heifers superovulated in different months （Jan, Jul, Oct ）, the heifers superovulated in Jul less average useable embryo number than the other two groups did （P〈0.05）, but more average non-fertilized number than the other two groups, heat stress could influence the reproductive mechanism of heifers and the superovulation.

关 键 词：重复超排 热应激 

分 类 号：S823.3[农业科学—畜牧学]