The objective of the present study was to estimate the genetic parameters associated with the achievement of desirable weight, conformation, and fat specifications, represented by a series of binary traits. The desired specifications were those stipulated by Irish beef processors, in accordance with the EUROP carcass grading system, and were represented by a carcass weight between 270 and 380 kg, a fat score between 2+ and 4= (between 6 and 11 on a 15-point scale), and a conformation score of O= or better (≥5 on a 15-point scale). Using data from 58,868 beef carcasses, variance components were estimated using linear mixed models for these binary traits, as well as their underlying continuous measures. Heritability estimates for the continuous traits ranged from 0.63 to 0.73; heritability estimates for the binary traits ranged from 0.05 to 0.19. An additional trait was defined to reflect if all desired carcass specifications were met. All genetic correlations between this trait and the individual contributing binary traits were positive (0.38 to 0.87), while all genetic correlations between this trait and the continuous carcass measures were negative (−0.87 to −0.07). The genetic parameters estimated in the present study signify that potential exists to breed cattle that more consistently achieve desirable carcass metrics at harvest.

中文翻译：

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牛的。体规格已达到中等遗传控制。

本研究的目的是估计与实现所需体重，构象和脂肪规格有关的遗传参数，这些遗传参数由一系列二元性状表示。所需规格是爱尔兰牛肉加工商根据EUROP car体分级系统规定的规格，以were体重量在270至380公斤之间，脂肪评分在2+至4 =（15到6至11之间）表示点评分），构象得分为O =或更高（在15点评分上≥5）。使用来自58868个牛car体的数据，使用线性混合模型估算了这些二元性状及其潜在的连续测量值的方差成分。连续性状的遗传力估计值在0.63至0.73之间。二元性状的遗传力估计范围为0.05至0.19。定义了另一个特征以反映是否满足所有所需的cas体规格。该性状与个体贡献的二元性状之间的所有遗传相关均为正（0.38至0.87），而该性状与连续car体度量之间的所有遗传相关均为负（-0.87至-0.07）。在本研究中估计的遗传参数表明存在育种牛的潜力，该牛在收获时更一致地达到理想的cas体指标。