大白猪和长白猪主要生长性状的遗传参数估计OA

This study aims to analyze the fixed effects and estimate heritability parameters for growth traits in Large White and Landrace pigs.Through a systematic analysis of key growth traits in these two major breeds,the research provides a foundational basis for subsequent breeding programs.The target populations in this study consisted of Large White and Landrace pigs from a core breeding farm in Shaanxi Province.Pedigree information comprising 8 981 records(7 425 for Large White and 1 556 for Landrace)and growth trait records totaling 6 626 entries(5 594 for Large White and 1 032 for Landrace)were col-lected and documented from 2021 to 2023.The effects of birth year,season of birth,parity,birth weight,and age at testing on growth traits were analyzed using ASReml-R statistical software.Genetic parameters(variance components,heritability,and genetic correlations)were estimated through multiple-trait animal model.The traits analyzed included age to 100 kg(AGE)and average daily gain to 100 kg(ADG).The findings indicated that birth year,season of birth,parity,and age at testing exerted highly significant or significant effects(P＜0.01;P＜0.05)on the growth traits of both Large White and Landrace pigs.The heritability estimates for AGE and ADG were 0.441 and 0.436 for Large White,and 0.468 and 0.481 for Landrace,respectively,indicating high heritability.The genetic correlation coefficients between AGE and ADG were-0.999 for both breeds,and the phenotypic cor-relation coefficients were also—0.999,reflecting a strong negative relationship.The results demonstrate that fixed effects such as birth year,season,parity,birth weight,and age at testing should be appropriately considered dur-ing the breeding process to optimize growth traits.These findings provide a theoretical basis and valuable reference for genetic selection and breeding strategies in pigs.