Núñez-Dominguez R, Van Vleck L D, Boldman K G, Cundiff L V
Department of Animal Science, University of Nebraska, Lincoln 68583-0908.
J Anim Sci. 1993 Sep;71(9):2330-40. doi: 10.2527/1993.7192330x.
The purpose of this study was to estimate the correlation between the expression of genes from sires in purebred and crossbred progeny (rPC) and in Hereford and Angus F1 calves (rHA). Performance traits were weights at birth, 200 d, and 365 d. Progeny from Hereford, Polled Hereford, and Angus bulls mated to Hereford or Angus cows were used to estimate rPC. Progeny from Charolais, Shorthorn, Simmental, Limousin, Maine-Anjou, Chianina, Gelbvieh, Tarentaise, and Salers bulls mated to Hereford or Angus cows were used to estimate rHA. Performances in purebreds (P) and crosses (C) or in Hereford (H) and Angus (A) F1 calves were treated as separate traits. A multivariate animal model with birth year-cow age-sex subclasses, random correlated direct and maternal additive genetic effects, and maternal permanent environmental effects was used. Separate analyses were done by breed of sire. A derivative-free algorithm was used to obtain REML estimates of (co)variance components. Weighted averages across breeds of estimates of heritability for P, C, H, and A were, respectively, .61, .51, .47, and .40 for birth weight, .41, .46, .37, and .34 for weaning weight, and .50, .49, .42, and .46 for yearling weight. Estimates of rPC ranged from .88 to .97, .55 to .94, and .68 to .86 for weights at birth, 200 d, and 365 d, respectively. Estimates of rHA ranged from .43 to .99, .56 to .95, and .50 to .98 for weights at birth, 200 d, and 365 d, respectively. Weighted averages of estimates of rPC and rHA across sire breeds were, respectively, .93 and .85 for birth weight, .77 and .73 for weaning weight, and .76 and .86 for yearling weight. These results indicate that ranking of sires producing purebreds or crosses, or crossbred calves from different breeds of dams, is approximately the same for birth and yearling weights, but some reranking might occur for weaning weight.
本研究的目的是估计纯种和杂交后代中父系基因表达（rPC）与赫里福德和安格斯F1代犊牛中父系基因表达（rHA）之间的相关性。生产性能性状包括出生重、200日龄体重和365日龄体重。将赫里福德、无角赫里福德和安格斯公牛与赫里福德或安格斯母牛交配所产后代用于估计rPC。将夏洛莱、短角牛、西门塔尔、利木赞、缅因安茹、契安尼娜、吉尔维耶、塔朗泰斯和萨勒斯公牛与赫里福德或安格斯母牛交配所产后代用于估计rHA。纯种（P）和杂交种（C）或赫里福德（H）和安格斯（A）F1代犊牛的生产性能被视为不同的性状。采用包含出生年份-母牛年龄-性别亚类、随机相关的直接和母体加性遗传效应以及母体永久环境效应的多变量动物模型。按父系品种进行单独分析。使用无导数算法获得（协）方差成分的REML估计值。P、C、H和A的遗传力估计值在各品种间的加权平均值分别为：出生体重为0.61、0.51、0.47和0.40；断奶体重为0.41、0.46、0.37和0.34；周岁体重为0.50、0.49、0.42和0.46。rPC的估计值在出生重、200日龄体重和365日龄体重时分别为0.88至0.97、0.55至0.94和0.68至0.86。rHA的估计值在出生重、200日龄体重和365日龄体重时分别为0.43至0.99、0.56至0.95和0.50至0.98。rPC和rHA在各父系品种间估计值的加权平均值分别为：出生体重时为0.93和0.85；断奶体重时为0.77和0.73；周岁体重时为0.76和0.86。这些结果表明，对于出生重和周岁体重，生产纯种或杂交种或不同母本品种杂交犊牛的公牛排名大致相同，但断奶体重可能会出现一些重新排名的情况。
