利用结构基因座和微卫星标记分析了中国蒙系绵羊4个品种间的基因流动情况。结果显示, 由结构基因座得出的遗传分化系数在0.0164 ~ 0.0455之间, 由微卫星位点得出的遗传分化系数在0.0107 ~ 0.0239之间, 说明遗传变异绝大部分存在于品种内, 蒙系绵羊品种间的遗传分化水平很低。结构基因座(N_m = 7.971)和微卫星位点(N_m = 15.732)都反映出品种间的基因流通畅。品种间的遗传差异与地理距离之间无直接相关关系。初步推断我国蒙系绵羊品种间的遗传分化主要是自然选择(生境异质性)作用的结果。

Gene flow was analyzed among four sheep breeds of Mongolian Group in China using structural gene loci and microsatellite markers.Results showed that genetic differentiation was 0.0164―0.0455 by using structural loci, and was 0.0107―0.0239 by using microsatellite loci.This illustrated that most variations existed within breeds and genetic differen-tiation level was very low among sheep breeds of Mongolian Group in China.There was substantial Gene flow among the breeds as estimated by the structural loci (N_m=7.971) or the microsatellite method(N_m=15.732).There was no direct rela-tionship between genetic differences from breeds and geographical distances.It is concluded that genetic differentiation of sheep breeds of Mongolian Group in China is mainly the result of natural selection (different living conditions).