Koh Daeyoung, Lee Jeongkoo, Won Seunggun, Lee Chaeyoung, Kim Jongbok
Department of Bioinfomatics and Life Science, Soongsil University, Seoul 156-743, Korea .
Asian-Australas J Anim Sci. 2014 Oct;27(10):1387-93. doi: 10.5713/ajas.2014.14170.
This study aimed to estimate genetic correlation between carcass grading and retail productivity traits and to estimate the correlated response on retail productivity traits through selection for carcass grading traits in order to assess the efficacy of indirect selection. Genetic parameters were estimated with the data from 4240 Hanwoo steers using mixed models, and phenotypes included carcass weight (CWT), back fat thickness (BFT), eye muscle area (EMA), marbling (MAR), and estimated lean yield percentage (ELP) as the carcass grading traits, and weight and portion of retail cuts (RCW and RCP), trimmed fats (TFW and TFP) and trimmed bones (TBW and TBP) as the lean productivity traits. The CWT had positive genetic correlations with RCW (0.95) and TFW (0.73), but its genetic correlation with RCP was negligible (0.02). The BFT was negatively correlated with RCP (-0.63), but positively correlated with TFW and TFP (0.77 and 0.70). Genetic correlations of MAR with TFW and TFP were low. Among the carcass grading traits, only EMA was positively correlated with both RCW (0.60) and RCP (0.72). The EMA had a relatively strong negative genetic correlation with TFW (-0.64). The genetic correlation coefficients of ELP with RCP, TFW, and TFP were 0.76, -0.90, and -0.82, respectively. These correlation coefficients suggested that the ELP and EMA might be favorable traits in regulating lean productivity of carcass.
本研究旨在估计胴体分级与零售生产率性状之间的遗传相关性，并通过选择胴体分级性状来估计零售生产率性状的相关反应，以评估间接选择的效果。利用混合模型，根据4240头韩牛阉牛的数据估计遗传参数，表型包括胴体重（CWT）、背膘厚度（BFT）、眼肌面积（EMA）、大理石花纹（MAR）和估计瘦肉产量百分比（ELP）作为胴体分级性状，以及零售切块的重量和比例（RCW和RCP）、修整脂肪（TFW和TFP）和修整骨头（TBW和TBP）作为瘦肉生产率性状。CWT与RCW（0.95）和TFW（0.73）具有正遗传相关性，但其与RCP的遗传相关性可忽略不计（0.02）。BFT与RCP呈负相关（-0.63），但与TFW和TFP呈正相关（0.77和0.70）。MAR与TFW和TFP的遗传相关性较低。在胴体分级性状中，只有EMA与RCW（0.60）和RCP（0.72）均呈正相关。EMA与TFW具有相对较强的负遗传相关性（-0.64）。ELP与RCP、TFW和TFP的遗传相关系数分别为0.76、-0.90和-0.82。这些相关系数表明，ELP和EMA可能是调节胴体瘦肉生产率的有利性状。
