中文摘要：

绵羊的多产性（Prolifcacy）即初生产羔数,包括产羔数和初生活羔数两性状。产羔数属低遗传力性状,其遗传力估值为0.1左右,重复力为0.15,变异系数为0.25,不同报道的差异可能源于抽样误差或未经校对的环境效应。胚胎死亡率占潜在子代的25%～50%,这是阻碍母羊多产性的关键,胚胎死亡有遗传上的原因,也有营养、环境和疾病方面的原因,就遗传方面来讲,染色体易位、血液型和子宫内环境等胚胎死亡有特别密切的关系。现将国内外有关多产遗传机制的研究综述如下。

英文摘要：

The sheep prolificacy,namely litter size,included the number of litter size and liver lambs.Litter size is a low heritability,and its heritability,repeatability and coefficient of variation are 0.1,0.15 and 0.25,respectively.Because present the sampling errors and/or the unadjusted environment effects,the heritability of litter size is difference.In sheep,the embryonic mortality account for 25%-50% of potential litter size and has grown as a primary hamper in prolificacy of sheep.The reasons of embryonic mortality involved the heredity,nutrition,environment and disease.Among the heredity,chromosomal translocation and inner environment of the uterus are closely correlated with the embryonic morality.In this article,we reviewed the research progress about the relationship between the inner environment of the uterus and prolificacy in sheep.