基于随机回归模型的如皋黄鸡产蛋数遗传参数分析

Estimation of genetic parameters for egg production of Rugao Yellow Chicken with random regression

【目的】应用随机回归模型分析如皋黄鸡产蛋数的方差组分和遗传参数。【方法】收集2009-2012年如皋黄鸡的生产记录,包括9 298只蛋鸡的46 327条月产蛋记录。应用随机回归模型分析时将Legendre多项式嵌入加性遗传效应、永久环境效应以及固定效应,各产蛋月以不同的残差效应处理。加性遗传与永久环境效应分别以1~4阶Legendre多项式评估,以AIC、BIC以及残差值选择最优模型。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】如皋黄鸡月产蛋数遗传力为0.05~0.32;开产第2月产蛋数遗传力最低,第1~2月的产蛋数遗传力在0.1以下,第3~7月产蛋数遗传力为0.20~0.32;如皋黄鸡第1个月产蛋数与其他月份产蛋数遗传相关系数较低,相邻产蛋月遗传相关系数较高。【结论】如皋黄鸡产蛋数遗传力较低;随机回归模型适用于地方鸡产蛋数遗传参数估算。

【Objective】The goal of this study was to estimate variance components and genetic parameters for egg production of Rugao Yellow Chicken with random regression model（RRM）.【Method】Egg production data of Rugao Yellow Chicken were collected from 2009 to 2012with a total of 46 327 monthly records corresponding to 9 298 hens.With RRM,Several Legendre polynomials were embedded in RRM to estimate the fixed,direct genetic and permanent environment effects.The residual was grouped into 7variance levels for each month.One to four order polynomials were used to evaluate the direct additive genetic,permanent environment effects and fixed effects.Models were evaluated using AIC,BIC and residual values.Covariance components were also estimated using AIREML method with WOMBAT software.【Result】The heritability of monthly egg numbers of Rugao Yellow Chicken ranged from 0.05 to 0.32.The lowest heritability of egg production emerged at the second month.During the first two months,the heritability was lower than 0.1while it ranged from 0.20 to 0.32 for other months.The genetic correlations between the first month and other months were low,and the correlations of neighbor months were high.【Conclusion】Egg production heritability of Rugao Yellow Chicken was low.Random regression model was an effective method for estimation of local chicken.