Covariance components were estimated for growth traits (BW, birth weight; WW, weaning weight; YW, yearling weight), visual scores (BQ, breed quality; CS, conformation; MS, muscling; NS, navel; PS, finishing precocity), hip height (HH), and carcass traits (BF, backfat thickness; LMA, longissimus muscle area) measured at yearling. Genetic gains were obtained and validation models on direct and maternal effects for BW and WW were fitted. Genetic correlations of growth traits with CS, PS, MS, and HH ranged from 0.20 ± 0.01 to 0.94 ± 0.01 and were positive and low with NS (0.11 ± 0.01 to 0.20 ± 0.01) and favorable with BQ (0.14 ± 0.02 to 0.37 ± 0.02). Null to moderate genetic correlations were obtained between growth and carcass traits. Genetic gains were positive and significant, except for BW. An increase of 0.76 and 0.72 kg is expected for BW and WW, respectively, per unit increase in estimated breeding value (EBV) for direct effect and an additional 0.74 and 1.43, respectively, kg per unit increase in EBV for the maternal effect. Monitoring genetic gains for HH and NS is relevant to maintain an adequate body size and a navel morphological correction, if necessary. Simultaneous selection for growth, morphological, and carcass traits in line with improve maternal performance is a feasible strategy to increase herd productivity.

中文翻译：

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Nelore 牛生长、视觉评分、高度和胴体性状的遗传分析

估计生长性状（BW，出生体重；WW，断奶体重；YW，一岁体重）、视觉评分（BQ，品种质量；CS，体型；MS，肌肉；NS，肚脐；PS，成年早熟）的协方差分量，一岁时测量的臀高 (HH) 和胴体性状（BF，背膘厚度；LMA，最长肌面积）。获得了遗传收益，并安装了对 BW 和 WW 的直接和母体影响的验证模型。生长性状与 CS、PS、MS 和 HH 的遗传相关性范围为 0.20 ± 0.01 至 0.94 ± 0.01，与 NS 呈正相关且较低（0.11 ± 0.01 至 0.20 ± 0.01），与 BQ 呈有利关系（0.14 ± 0.02 至 0.37 ± 0.02）。在生长和屠体性状之间获得了零到中度的遗传相关性。除 BW 外，遗传增益是积极且显着的。BW 和 WW 预计增加 0.76 和 0.72 公斤，分别是直接效应的估计育种值 (EBV) 每增加一个单位，母体效应的 EBV 每单位增加分别增加 0.74 和 1.43 公斤。如有必要，监测 HH 和 NS 的遗传增益与保持足够的体型和肚脐形态矫正相关。根据提高母性性能同时选择生长、形态和胴体性状是提高畜群生产力的可行策略。