Meyer K, Carrick M J, Donnelly B J
Animal Genetics and Breeding Unit, University of New England, Armidale, NSW, Australia.
J Anim Sci. 1993 Oct;71(10):2614-22. doi: 10.2527/1993.71102614x.
Estimates of covariance components and genetic parameters were obtained for birth, weaning, 200-d, and 400-d weight for a herd of Polled Herefords and a herd of a multibreed synthetics, the so-called Wokalups. Data originated from an experiment in Western Australia selecting for preweaning growth rate. Analyses were carried out by REML fitting an animal model including genetic and permanent environmental maternal effects. Wokalups showed consistently more phenotypic variation, partly due to a scale effect, and higher direct and lower maternal heritabilities than Herefords. Maternal environmental effects were more than twice as important in Herefords than in Wokalups. Estimates of both genetic and environmental correlations among weaning and subsequent weights were essentially unity, identifying maternal effects found for postweaning weights as a "carry over" of those on weaning weight.
对一群无角海福特牛和一群多品种合成牛（即所谓的沃卡卢普斯牛）的出生重、断奶重、200日龄体重和400日龄体重的协方差分量和遗传参数进行了估计。数据源自澳大利亚西部一项针对断奶前生长速度的选择试验。通过限制最大似然法（REML）进行分析，拟合了一个包含遗传和永久性环境母体效应的动物模型。沃卡卢普斯牛始终表现出更多的表型变异，部分原因是规模效应，并且其直接遗传力高于海福特牛，母体遗传力低于海福特牛。母体环境效应在海福特牛中的重要性是沃卡卢普斯牛的两倍多。断奶重与后续体重之间的遗传和环境相关性估计值基本为1，这表明断奶后体重的母体效应是断奶体重母体效应的“延续”。
