Estimation of genetic parameters of body size and body weight at different growth stages of Luzhong mutton sheep
The objective of this study is to estimate the genetic parameters of body size and body weight of Luzhong mutton sheep at different growth stages,and to analyze the genetic rules between various traits,in order to provide a theoretical basis for the breeding planning of Luzhong mutton sheep.A total of 15 040 Luzhong mutton sheep body size and body weight data were collected from 2015 to 2019,and the body weight,body height,body length,chest circumference,chest width,chest depth,and cannon circumference traits of firstborn,3 months,6 months,one year and adult stage were taken as the research objects,and AI-REML combined with EM algorithm in DMU software was used to cooperate with animal models,taking birth year,birth season and sex as fixed effects,and additive effect and maternal effect as random effects,to estimate the heritability and genetic correlation of each trait.The heritability of Luzhong meat sheep weight from fristborn to adult was 0.18-0.51,the heritability of body height was 0.15-0.60,the heritability of body length was 0.09-0.42,the heritability of chest circumference was 0.11-0.43,the heritability of chest width was 0.05-0.39,the heritability of chest depth was 0.06-0.21,the heritability of can-non circumference was 0.11-0.59,and the maternal heritability of the firstborn to 6 months was 0.15-0.26,the genetic correlation coefficient between traits at different stages was-0.52-0.98,and the phenotypic correlation was-0.05-0.95.The genetic correlation coefficient of body weight between different growth stages was-0.10-0.87,and the phenotype correlation was 0.01-0.91.The maternal genetic effect had a high influence on the early growth traits of Luzhong meat sheep,and with the gradual weakening of the maternal genetic effect of growth,the heritability of body size and body weight of one year old was the highest in this study,and there was a genetic corre-lation between body size and body weight at different growth stages.The genetic correlation coefficient between 6 months old and one year old was the highest among the growth stages.
万方数据
维普
