统计模型对如皋黄鸡产蛋数遗传参数的影响

Estimation of Genetic Parameters for Egg Production in Rugao Chicken with Different Models

为了评估不同的动物模型对如皋黄鸡产蛋数遗传参数的影响。2009—2012年采集如皋黄鸡的生产记录,包括8575只蛋鸡（来自242个父系,1362个母系）,评估模型分为单性状模型和多性状模型,利用WOMBAT软件以平均信息约束最大似然法（AIREML）分析表型方差组分。结果表明：开产日对统计第1—2月产蛋数有着重要影响,应将其列入固定效应;加性遗传方差小于永久环境方差,产蛋数受环境因素影响更多一些;开产第1月产蛋数遗传力最高,产蛋高峰产蛋数遗传力最低,产蛋后期产蛋数遗传力略有上调;如皋黄鸡前4个月产蛋数与开产至40周龄产蛋数遗传相关系数在0.67-0.79之间,相邻产蛋月遗传相关系数较高;开产阶段产蛋数与产蛋末期产蛋数的相关系数较小,因此,地方特色蛋鸡选育时应考虑增加产蛋后期产蛋数指标。

The main aim of the present study was to assess whether the genetic parameters on the egg production in Rugao Yellow Chicken changed with different models. The production recorders on the Rugao Yellow Chicken were collected from 2009 to 2012. Animals included 8575 individual fowls from 242 sires and 1362 dams. The evaluated models were consisted of uniand multiple-trait model. （Co） variance components were estimated with AIREML method using WOMBAT software. Results suggested： （1） the day at the 1st egg should be included in the fix effects because of its important role in early egg production; （2） since the direct genetic covariance was less than that of permanent environment, it seemed safe to conclude that the environment was the main phenotypic variations sources; （3） the heritability of egg numbers was high at the early laying period, low at the peak of the laying phase, and increased again at the late laying period; （4） for Rugao Yellow Chicken, the genetic correlations between the monthly egg production and EN40 ranged from 0.67 to 0.79, the correlations of neighbor months was high; （5） considering the correlation between early and terminal laying phase was low, it was necessary to increase statistical times during local fowl improvement.