鸡产蛋数遗传力的Meta分析

Heritability of Egg Production of Chickens:A Meta-analysis

【目的】产蛋数是蛋鸡、肉种鸡育种工作中主选性状,但已有研究报道的产蛋数遗传力跨度较大,使育种工作者无从选择。对鸡产蛋数遗传力进行Meta分析,旨在评估蛋鸡、肉种鸡及地方鸡种产蛋数遗传力及其动态变化规律。【方法】通过检索中国知网、ISI Web of Science、PubMed、EBSCO及ProQuest数据库,收集1990—2019年国内外发表的产蛋数遗传评估相关文献,共获得72篇符合内控标准的论文。应用随机效应模型、亚组分析及两步法回归分析评估产蛋数遗传力数据集。【结果】随机效应模型分析结果表明,产蛋数遗传力为0.234±0.009,不同研究结果之间异质性较高;亚组分析结果表明,白壳蛋鸡、褐壳蛋鸡亚群产蛋数遗传力分别为0.242±0.022、0.224±0.017,肉种鸡、地方鸡亚群产蛋数遗传力分别为0.221±0.029、0.240±0.014,产蛋后期遗传力呈现下降。产蛋数遗传力方程为h2=-0.0023t+0.2253。【结论】遗传因素对鸡产蛋数变异贡献较低,遗传力的异质性可归因于遗传背景和周龄。

【Objective】Egg production is a major selected trait in the breeding of layer and broiler breeder.A number of researches and reports on the heritability of egg production have been conducted,however,the results were discrepant,which resulted in the tough choice of breeders.The meta-analysis aimed to evaluate the heritability of egg production of layers,broiler breeders and local chickens and the dynamics on the heritability.【Method】Relevant documents on the evaluation of heritability of egg production published at home and abroad from 1990 to 2019 were collected by searching the databases of CNKI,ISI web of science,PubMed,EBSCO and ProQuest.A total of 72 papers were included in the metaanalysis.The dataset of the heritability of egg production was assessed with random effect model,subgroup analysis and twostepwise regression analysis.【Result】Random effect model showed that the heritability of egg production was 0.234±0.009 and there were great differences between different studies.Subgroup analysis showed that the heritability of white shelled layers and brown shelled layers was 0.242±0.022 and 0.224±0.017,respectively,and that of broiler breeders and local chickens was 0.221±0.029 and 0.240±0.014,respectively.The heritability showed a declining trend during late laying period.Regression analysis showed that the heritability function expressed as:h2=-0.0023t+0.2253.【Conclusion】A small proportion of egg production variation could attribute to the genetic factors,and the genetic background and week age might contribute to the heterogeneity between different studies.