应用多性状动物模型评估蛋鸡蛋形指数遗传参数

发布时间：2019-04-21 16:08

【摘要】：以动物模型结合平均信息约束最大似然算法(AIREML)分析蛋鸡蛋形指数遗传力、重复力和遗传相关系数,剖析蛋形指数遗传参数动态变化规律。试验素材来自白莱航鸡与绿壳蛋鸡分离群体,包括亲代、F_1代和F_2代,总计2 326只母鸡。每一世代32~60周龄,期间每4周测量1次蛋品质,共采集蛋形指数数据19825条。以WOMBAT软件估计遗传方差、永久环境方差和残差。结果表明:品种、世代和周龄,对蛋形指数有重要影响,将其列入固定效应;蛋形指数性状并非正态分布,应用平方根反正弦进行数据转换,但转换前后遗传参数估计值差异不显著(P0.05);蛋形指数遗传力为0.31~0.47,遗传方差随周龄增加而增加,至48周龄达到极大值,之后小幅回落;重复力为0.47~0.61,永久环境方差基本稳定在同一水平;不同周龄蛋形指数遗传相关系数为0.91~0.99,永久环境相关系数为0.61~0.92,相邻周龄遗传相关系数较高。蛋形指数重复力较高、周龄之间遗传相关系数接近于1,以个体选择可以有效获取遗传参数。
[Abstract]:The egg shape index heritability, repetition power and genetic correlation coefficient of laying hens were analyzed by means of animal model combined with average information constrained maximum likelihood algorithm (AIREML), and the dynamic variation rule of egg shape index genetic parameters was analyzed. The experimental materials were obtained from the separated groups of white-white hens and green-shell laying hens, including parent generation, F _ 2 generation and F _ 2 generation, with a total of 2 326 hens. The egg quality was measured every 4 weeks and 19825 egg shape index data were collected. Genetic variance, permanent environmental variance and residual were estimated by WOMBAT software. The results showed that the variety, generation and week age had an important effect on egg shape index, and it was included in the fixed effect. Egg shape index characters were not normal distribution, square root sine was used for data conversion, but there was no significant difference in genetic parameters before and after the transformation (P0.05). The heritability of egg shape index was 0.31 ~ 0.47, the genetic variance increased with the increase of week age, reached the maximum value at 48 weeks, then decreased slightly, the repetition power was 0.47 ~ 0.61, and the variance of permanent environment was basically stable at the same level. The genetic correlation coefficients of egg shape index and permanent environment were 0.91% and 0.61% respectively at different weeks of age, and the genetic correlation coefficients of adjacent weeks were higher. The reproducibility of egg shape index was higher, and the genetic correlation coefficient between weeks was close to 1. The genetic parameters could be obtained effectively by individual selection.
【作者单位】：江苏省家禽科学研究所;
【基金】：现代农业产业技术体系建设专项资金项目(CARS-41-K02) 江苏省自然科学基金项目(BK20131237) 江苏省农业三新工程项目(SXGC[2015]299) 江苏省农业科技自主创新资金项目(CX[16]1008) 扬州市科技计划项目(YZ2014148)
【分类号】：S831.2

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