13周龄母鸡体尺性状主基因+多基因混合遗传模型分析

Genetic analysis of body size traits of 13-week-old hens using a mixed model considering major gene and polygene

研究以绿壳蛋鸡黑羽纯系和白来航鸡为对象构建分离群体,测定亲本P1、P2、F1和F2代母鸡13周龄体尺,运用主基因+多基因混合遗传分析软件SEA-G4F2对分离群体13周龄体尺性状进行遗传分析。结果表明,母鸡13周龄胫围、胫长、龙骨长、体斜长和胸宽的最适模型均为E模型,即两对加性-显性-上位性主基因+加性-显性-上位性多基因混合遗传模型,主基因遗传率分别为33.58%、25.74%、27.02%、24.92%和33.72%,龙骨长、体斜长和胸宽的多基因遗传率为1.13%、1.71%和4.61%;13周龄胸角最适模型为E-1,即两对加性-显性-上位性主基因+加性-显性多基因混合遗传模型,主基因遗传率为55.06%。胫围、胫长和胸角多基因遗传率均为0,各个性状主基因遗传效应均大于多基因遗传效应。

In this study, green-eggshell layer black feather pure lines and White Leghorn acted as parents to constructed segregating population, body size traits of hens at 13-week-old of P1, P2, F1 and F2 were measured, the analysis software of major gene and polygene mixed inheritance model in the hens body size traits was SEA-G4F2. The results showed that the best model of shank girth, shank length, keel length, body slanting length and chest width of hens at 13-week-old was model E, namely two pairs of additive-dominance-epistatic major gene plus additive-dominance-epistaUc polygene mixed genetic model, their heritability of major gene were 33.58%, 25.74%, 27.02%, 24.92% and 33.72%, respectively, the hedtablity of polygene in keel length, body slanting length and chest width were 1.13%, 1.71 % and 4.61%, respectively; the best mod el of chest angle was model E-1, which named two pairs of additive-dominance-epistaUc major gene plus additive-dominance polygene mixed genetic model, the heritability of major gene was 55.06%. the polygene heritability of shank girth, shank length and chest angle were 0, major gene has a bigger genetic effect than polygene in these traits.