Department of Animal Breeding and Genetics, Graduate School of Agricultural Science, Tohoku University, 1-1 Aoba-ku, Sendai 981-8555, Japan.
J Anim Sci. 2010 Mar;88(3):879-84. doi: 10.2527/jas.2009-2072. Epub 2009 Nov 6.
The objective of this study was to find optimal traits for inclusion in selection criteria by estimating genetic parameters for direct genetic, maternal genetic, and common environmental effects for growth traits before 60 d of age and for the number of teats under an open breeding population, and to evaluate genetic relationships for traits at 60 d of age. Records of 2,344 male and 2,204 female purebred Berkshire pigs were analyzed. For BW at 14 d of age and for weaning weight, the heritabilities of a direct genetic effect were greater than those of a maternal genetic effect. This result is contrary to previous results showing a gradual decrease in the maternal genetic effect and an increase in the direct genetic effect up to weaning. The positive genetic correlations between direct and maternal genetic effects for BW at 14 d of age and weaning weight are clearly contrary to other reports. This phenomenon seems to be caused by creep feeding begun just after the birth of the piglets and maintained throughout the preweaning period in this Berkshire population.
本研究旨在通过估计生长性状在 60 日龄前和乳头数在开放繁殖群体下的直接遗传、母本遗传和共同环境效应的遗传参数，找到纳入选择标准的最佳性状，并评估 60 日龄时性状的遗传关系。分析了 2344 头公猪和 2204 头母猪纯种伯克夏猪的记录。对于 14 日龄 BW 和断奶重，直接遗传效应的遗传力大于母本遗传效应的遗传力。这一结果与之前的结果相反，之前的结果表明，母本遗传效应逐渐降低，而直接遗传效应在断奶前增加。14 日龄 BW 和断奶重的直接遗传效应和母本遗传效应之间的正遗传相关显然与其他报道相反。这种现象似乎是由仔猪出生后立即开始的哺乳期补饲引起的，并在本伯克夏猪群的整个断奶期内维持。
