Cue R I, Hayes J F
J Dairy Sci. 1985 Apr;68(4):958-62. doi: 10.3168/jds.S0022-0302(85)80915-2.
Multitrait restricted maximum likelihood methods were used for estimation of heritabilities and genetic and phenotypic correlations between calving ease and calf survival. These analyses examined both direct and maternal effects. Genetic correlation for direct effects between calving ease and calf survival was approximately -.8 in both heifers and cows, indicating favorable associations, whereas phenotypic correlations were -.32 and -.22.
多性状限制最大似然法用于估计产犊难易度与犊牛存活率之间的遗传力、遗传相关性和表型相关性。这些分析考察了直接效应和母体效应。在小母牛和母牛中，产犊难易度与犊牛存活率直接效应的遗传相关性均约为 -0.8，表明存在有利关联，而表型相关性分别为 -0.32 和 -0.22。
