焦虫病对牛胚胎生产的影响报告

Report on the Impacts of Scorcherosis on Embryo Production in Bovine Cattle

利用进口加系肉用型西门塔尔优秀后代和美加系优秀种公牛冻精生产胚胎,改良本地肉牛,有利于高效地利用引进种质,加快我国肉牛品种改良的速度。目的:本文评估实施胚胎生产过程中,供体母牛在放牧中导致焦虫病,对胚胎生产结果及冻胚移植成功率影响。方法:本文选择40头10-16月龄加系西门塔尔种母牛进行超数排卵处理生产体内胚胎。在超排处理过程,其中17头放牧的供体牛出现焦虫病症状。对照组为24头舍饲健康供体牛。两组牛产的胚胎冷冻后,分别解冻和移植了30(焦虫病组)和26(对照组)枚胚胎。结果表明两组牛只获取的胚胎总数差异不明显,但发病牛只生产可用胚率和冻胚移植成活率均明显低于健康牛只。结论:焦虫病极易导致牛只体温升高,超过39.5℃将会严重影响胚胎的产量和质量。

Embryos collected from progeny reproduced by imported Canadian Simmental cattle,mating with the semen from Northern American Simmental bulls were used to improve the genetics of local beef cattle,which would improve the efficiency of imported genetics and facilitate the genetic improvement of beef breeds in China.Purpose:The impacts of Scorcherosis on embryo production and successful pregnancy are evaluated in the present study with the donors infected with Scorcherosis farming in field during embryo production.Methods:Forty Simmental heifers at 10-16-month age were super-ovulated to produce in vivo embryos,among whcih 17 donors were diagnosed as Scorcherosis during super-ovulating procedures.24 healthy donors raised inside barn were as the controls.Embryos produced from these two groups of animals were frozen,and 30(infected)and 26(control)embryos from each group then were thawed and implanted into recipients,respectively.Results based on this experiment indicate total embryos per donor from both groups are not significantly different,while the total transferable embryos and pregnant rates are significantly lower in Scorcherosis infected donors,compared to healthy ones.Conclusion:Cattle infection with Scorcherosis tends to cause the increase of body temperature,which will seriously reduce the number and quality of embryos when the temperature exceeds 39.5℃.