3周龄蛋鸡体质量性连锁遗传效应分析

Effects of sex linkage genetic variances on chick's body weight at third week age

以白莱航鸡、绿壳蛋鸡为亲本,构建F2资源群体,进行蛋鸡早期体质量遗传评估。结果表明:Z染色体基因对蛋鸡早期体质量加性遗传方差有贡献;遗传模型固定效应包括品种、世代及近交系数;蛋鸡F2分离群体3周龄体质量遗传力为0.52±0.03,其中Z染色体遗传力为0.07±0.02。蛋鸡早期体质量遗传评估时应考虑性染色体连锁遗传效应的影响;3周龄蛋鸡体质量属于中等偏高遗传力性状,可通过个体选育获取遗传进展。

To understand the genetic parameters for early body weight of hens,we used White leghorn reciprocal crossing with the blue eggshell hens to generate F2population and then performed genetic analysis.The results showed genes on Z chromosome contributed to the genetic additive variances of early body weight.The fix effects included breed,generation and inbreeding coefficients.The heritability on body weight at the age of3week in F2population was0.52±0.03,and0.07±0.02contributed from Z chromosome.Our study indicated that genetic evaluation on the early body weight should include the sex linkage effect.The heritability estimates were moderate to high for the body weight at the third week.For further study,it is better to select individual culture.