FecB基因对多胎品系绵羊培育的影响

Effect of Fecundity Booroola(FecB) Gene on Sheep Multiple Birth

繁殖力是绵羊的主要经济性状,如何提高绵羊繁殖力一直都是国内外研究者不断探寻的问题。FecB基因是科学家最早发现的与绵羊繁殖力有关的基因。近年来,人们一直试图通过分子遗传标记技术来培育具有高繁殖力的绵羊后代。经研究发现,在我国的策勒黑羊、多浪羊、小尾寒羊、杜寒杂交肉羊以及洼地绵羊等羊群中都存在FecB基因。并且FecB基因可能是这些绵羊具有多胎性状的主效基因。FecB基因通过增加排卵数,从而影响产羔数。但同时排卵数的提高对胚胎成活率也有一定的影响。可以通过制定科学的育种计划,选择优秀的母体,利用本地绵羊的抗逆性等方法来不断完善多胎品系绵羊的培育。本文从FecB基因作用机理和在国内外不同地区品种中的分布作了简要的综述,并对该基因的利用进行了展望。

Fecundity is one of the main characters of sheep. How to increase the fecundity of sheep has been studied by researchers in China and abroad. FecB gene was found to be related to the fecundity of sheep. In recent years, genetic molecular markers were used in the breeding of high fecundity sheep. It was found that FecB gene indwells in Wadi sheep, Duolang sheep and Cele sheep, little tailed Han sheep and Du Han hybrid sheep of China. Moreover, FecB gene may be the main multiple gene of these sheep. FecB gene can improve the ovulation and lambing, but the number of ovulation increased is effect of the rate of embryos survived. We can make a plan of scientific breeding by choosing excellent matrix and using the stress resistance of local sheep for the breeding of sheep, This article is a review on the mechanism of FecB gene, the distribution of varieties in different areas. The use of the gene was also discussed.