Lopez Bryan Irvine, Kim Tae Hun, Makumbe Milton Tinashe, Song Chol Won, Seo Kang Seok
Department of Animal Science and Technology, Sunchon National University, Suncheon 57922, Korea.
Asian-Australas J Anim Sci. 2017 Sep;30(9):1239-1244. doi: 10.5713/ajas.17.0002. Epub 2017 Mar 21.
This study was conducted to estimate breed-specific variance components for total number born (TNB), number born alive (NBA) and mortality rate from birth through weaning including stillbirths (MORT) of three main swine breeds in Korea. In addition, the importance of including maternal genetic and service sire effects in estimation models was evaluated.
Records of farrowing traits from 6,412 Duroc, 18,020 Landrace, and 54,254 Yorkshire sows collected from January 2001 to September 2016 from different farms in Korea were used in the analysis. Animal models and the restricted maximum likelihood method were used to estimate variances in animal genetic, permanent environmental, maternal genetic, service sire and residuals.
The heritability estimates ranged from 0.072 to 0.102, 0.090 to 0.099, and 0.109 to 0.121 for TNB; 0.087 to 0.110, 0.088 to 0.100, and 0.099 to 0.107 for NBA; and 0.027 to 0.031, 0.050 to 0.053, and 0.073 to 0.081 for MORT in the Duroc, Landrace and Yorkshire breeds, respectively. The proportion of the total variation due to permanent environmental effects, maternal genetic effects, and service sire effects ranged from 0.042 to 0.088, 0.001 to 0.031, and 0.001 to 0.021, respectively. Spearman rank correlations among models ranged from 0.98 to 0.99, demonstrating that the maternal genetic and service sire effects have small effects on the precision of the breeding value.
Models that include additive genetic and permanent environmental effects are suitable for farrowing traits in Duroc, Landrace, and Yorkshire populations in Korea. This breed-specific variance components estimates for litter traits can be utilized for pig improvement programs in Korea.
本研究旨在估计韩国三种主要猪品种从出生到断奶包括死胎在内的总产仔数（TNB）、活产仔数（NBA）和死亡率（MORT）的品种特异性方差分量。此外，还评估了在估计模型中纳入母本遗传效应和配种公猪效应的重要性。
分析使用了2001年1月至2016年9月从韩国不同农场收集的6412头杜洛克、18020头长白和54254头大白母猪的产仔性状记录。采用动物模型和限制最大似然法估计动物遗传、永久环境、母本遗传、配种公猪和残差的方差。
杜洛克、长白和大白品种的TNB遗传力估计值分别为0.072至0.102、0.090至0.099和0.109至0.121；NBA的遗传力估计值分别为0.087至0.110、0.088至0.100和0.099至0.107；MORT的遗传力估计值分别为0.027至0.031、0.050至0.053和0.073至0.081。永久环境效应、母本遗传效应和配种公猪效应占总变异的比例分别为0.042至0.088、0.001至0.031和0.001至0.021。模型间的斯皮尔曼等级相关性在0.98至0.99之间，表明母本遗传效应和配种公猪效应对育种值精度的影响较小。
包含加性遗传效应和永久环境效应的模型适用于韩国杜洛克、长白和大白猪群的产仔性状。这些窝产性状的品种特异性方差分量估计值可用于韩国的猪改良计划。
