甘肃高山细毛羊数量性状遗传相关和通径分析

Genetic correlation and path analysis of the quantitative traits in Gansu alpine fine-wool sheep

为了探讨甘肃高山细毛羊数量性状的遗传参数,研究应用2006—2007年甘肃皇城绵羊繁育技术推广站采集的甘肃高山细毛羊6个核心群育种资料,对初生重,出生等级,断奶毛长,断奶重,1.5岁毛长、细度、产毛量及体重的遗传力以半同胞组内相关法进行估测,对遗传相关以公羊的方差组分和协方差组分进行估测,并对计算出的相关系数进行显著性检验。结果表明:以上性状对产毛性状的影响存在很大差异,通径分析进一步揭示污毛量、净毛率及与其互作的性状(断奶重、剪毛后体重、毛丛长度、束强)是影响产毛量最主要的因素。

To investigate the genetic parameters of quantitative traits of Gansu alpine fine -wool sheep, the breeding data from 6 core groups of Gansu alpine fine - wool sheep, which collected at Gansu sheep breeding technology promotion station in Huangcheng from 2006 to 2007, were used to analyze genetic correlation and heritability of some quantitative traits, such as birth weight, birth grade, wool length at weaning, weaning weight, wool length of young sheep, fineness of young sheep, wool yield of young sheep, body weight of young sheep and so forth. The heritability was estimated with the half - sib intraclass correlation. The genetic correlation was analyzed with components of variance and covafi- ance in rams. In addition, the correlation coefficient was tested significantly. The results showed that there was a significant difference in the effects of these quantitative traits on the wool yield. The path analysis reveals that the dirty wool weight , clean wool rate and interaction traits of both including weaning weight, body weight after sheafing wool, staple length and strength, become the most important factors to affect the wool yield.