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《畜牧与饲料科学(英文版)》 2009-01
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Serum Esterase Polymorphisms and Their Associations with Prolificacy in Small Tail Han Sheep

YANG Ci-qing,LI Xiao-ying Life Science and Technique Department,Xinxiang Medical University,Xinxiang 453003  
[Objective] The aim of this research was to provide a theoretical basis for the breeding and identification of multiparous Small Tail Han sheep. [Method] The polymorphisms of serum esterase(Es) locus in Small Tail Han sheep were detected by vertical discontinuous polyacrylamide gel electrophoresis(PAGE) . According to the statistical analysis of different genotypes and their litter size,the correlation between Es polymorphisms and litter size was analyzed. [Result] There were three genotypes in Es locus,and Es++ was the dominate genotype. The differences of ewe litter size in the 1st parity among these three genotypes were nonsignificant(P0.05) . As far as the 2nd and 3rd parity was considered,the litter size of genotype Es++ was significantly(P0.05) higher than that of Es--and Es+-;the average litter size of Es++ was extremely significant(P0.01) higher than that of Es--and Es+-while there was no significant difference(P0.05) between the latter two. [Conclusion] The Es locus could be regarded as a genetic marker locus for early selection of high-yielding ewes and Es++ is the high-yielding genotype of Small Tail Han sheep.
【CateGory Index】: S826
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