体型评分性状的遗传分析及其在选种中的利用

发布时间：2018-10-19 15:12

【摘要】：本研究旨在围绕体型评分性状,探讨其与生产性状的遗传联系,并浅析其在生产中如何有效利用。通过比较分析了不同体型评分下,生产性状表型的差异;同时分别利用单/多性状线性模型和阈模型对大白猪体型评分性状进行了遗传参数估计,并计算了体型评分性状与部分主要生产性状之间的表型和遗传相关以及排名的秩相关。结果表明:随着体型评分的升高,达100 kg体重日龄与100 kg体重背膘厚均逐渐降低,差异极显著(P0.01),头胎产仔数差异不显著(P0.05);单性状和多性状线性模型体型评分遗传力分别为0.03和0.04,阈模型遗传力为0.21;此外,体型评分与头胎产仔性能呈强的正遗传相关,而与非头胎产仔性能呈弱相关,与生长性状呈强的负遗传相关;最后,秩相关结果显示,单一通过性状EBV排名来选种不可靠,但排名靠前个体体型评分均值在8.0左右,提示应综合体型评分和育种值排名来选种。
[Abstract]:The purpose of this study was to explore the genetic relationship between somatotype scoring traits and productive traits and to analyze how to use them effectively in production. The phenotypic differences of production traits under different somatotype scores were compared and the genetic parameters of somatotype scoring traits of large white pigs were estimated by single / multiple trait linear model and threshold model respectively. The phenotypic and genetic correlation and rank correlation between somatotype scoring traits and some major production traits were calculated. The results showed that the age of 100 kg body weight and the backfat thickness of 100 kg body weight decreased gradually with the increase of body size score. The heritability of single trait and multiple trait linear model was 0.03 and 0.04, and the heritability of threshold model was 0.21. In addition, there was a strong positive genetic correlation between somatotype score and first foetus performance, the difference was very significant (P0.01), and there was no significant difference in first litter size (P0.05), the heritability of single trait and multi-trait linear model was 0.03 and 0.04, respectively. However, there was a weak correlation with the performance of non-first-born offspring and a strong negative genetic correlation with the growth traits. Finally, the rank correlation results showed that the single EBV rank of traits was not reliable, but the average of individual somatotype score in the top rank was about 8.0. It is suggested that the selection of species should be combined with somatotype score and breeding value ranking.
【作者单位】：华南农业大学动物科学学院国家生猪种业工程技术研究中心;中国农业大学生物学院;中国农业大学动物科技学院;广东温氏食品集团股份有限公司;
【基金】：种猪全基因组选择技术研发与应用(2015B020231010) 广东省农业科技创新团队专项(20116LM1101、2016LM1104)
【分类号】：S828.2

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