蛋鸡资源群体蛋品质性状的因子分析

为了评估绿壳蛋鸡-白来航鸡资源群体蛋品质性状遗传参数,采用因子分析法对2 260只鸡的19 236条蛋品质记录进行了降维处理。从9个蛋品质性状中抽取4个公因子,可以解释79.16%的总变异。公因子分别描述蛋白品质、蛋壳品质、质量品质以及蛋形指数。蛋黄颜色的公因子方差只有0.06,表明该性状对蛋品质的贡献有限,可以将其从数据集去除。以公因子综合得分作为评价蛋品质的新指标,应用多性状动物模型分析遗传参数。资源群体蛋品质性状遗传力为0.18~0.46,遗传相关系数为-0.18~0.94,表型相关系数最高为0.94;新指标遗传力为0.39。这些结果表明因子分析适用于蛋品质性状遗传评估,新指标属于中等遗传力性状。本研究发掘的新指标携带大多数变异信息,有利于数据计算及选育提高蛋品质。

Factor Analysis of Egg Quality in a Crossbred Layer Population

This study estimated genetic parameters on egg quality traits using factor analysis.With a dimension-reduction method,a total of 19 236 egg quality records on 2 260 hens were evaluated.Four latent factors,which were interpreted as indicators of egg albumen,eggshell,mass and egg shape index,were extracted,accounting for 79.16% of the total variance of 9 egg quality traits.Communality on yolk color was 0.06,suggesting this trait did not contribute effectively to explain the total variation and could be dropped from the dataset.A new indicator of egg quality was derived from the factor sum scores.Estimation of genetic parameters of the new indicator and 9 original traits were carried out with a multiple-trait animal model.Heritability of egg quality ranged from 0.18 to 0.46.Genetic correlation coefficients varied from -0.18 to 0.94.The highest of phenotypic correlation was 0.94.Heritability of the new indicator was 0.39.Factor analysis should be an effective method to estimate egg qualities.New indicator for egg quality belonged to the median heritability trait.Most of the variances were held in the new indicator,which was useful to mine the data,and to improve the egg quality.