摘要
利用混合家系的亲缘相关法及父系半同胞法分别估测新杨州鸡主要产蛋性状的遗传力和性状间的遗传相关，并且建立了４种综合选择指数。开产日龄、３００日龄产蛋数、蛋重、５００日龄产蛋数的遗传力分别为：０．２８，０．１９，０．５８，０．２４；开产日龄与３００日龄产蛋数、蛋重和５００日龄产蛋数的遗传相关依次为：－０．５６，－０．２７，－０．３７；３００日龄蛋重与３００日龄产蛋数、５００日龄产蛋数呈弱相关。针对开产日龄、３００日龄产蛋数、３００日龄蛋重３个性状综合选择，制订了４种选择指数。其中２个选择指数的选择准确度高于另２个指数１０％～１２％，预测综合选择进展高９％～１３％。
Heretabilities were est imated from correlation between relatives of the mixed family for eggproduction in New Yangzhou chickens. Genetic correlations between traits were derived from sire componentsof variance in the half─sib analyses. Meantime, 4 selection indexes were calculated using b=P￣(-1) GW.Heri-tabillty of age at first egg(AFG),number of egg to 300 days old(NE-300d),egg weight(EW)and num-ber of egg to 500 days old(NE-500d) were 0. 28,0.19,0. 58,0. 24,respectively. Genetic corre-lations between AFG and NE-300d,EW,NE-500d were-0. 56,-0.27 and-0.37 respectively,Therewas lower genetic correlation between EW and NE.4 selection indexes were worked out.The result indicatedthat the selection accurancy and expected genetic advance of 2 indexes among 4 indexes were 10%～12%,9%～13%higher than the two others.
出处
《江苏农学院学报》
CSCD
1995年第2期65-68,共4页
Jiangsu Agricultural Research
基金
江苏省教委自然科学基金
关键词
遗传力
选择指数
鸡
新扬州鸡
产蛋量
heritability
genetics+correlations
selection indexes
domestic fowl
