Abstract
This study was carried out to estimate genetic parameters and breeding values of Hanwoo cows for carcass traits. Carcass records were collected from Korean steers raised at the private farms located in rural area of Gangwon-do and slaughtered from December 2004 to June 2008 at the three slaughter houses near fattening farm. The results obtained in this study were summarized as follows; The means and standard deviations of the carcass traits were 5.57±2.01 for marbling score (MS), 10.87±4.06 mm for backfat thickness (BFT), 87.87±9.07 cm 2 for eye muscle area (EMA), 426.75±49.27 kg for carcass weight (CW), and 65.80±3.80 for yield index (YI). Heritability estimates using single trait analyses were 0.36 for MS, 0.35 for BFT, 0.24 for EMA, 0.29 for CW, and 0.40 for YI, respectively. Genetic correlation coefficients of MS with BFT, EMA, CW, and YI were 0.21, 0.30, 0.21 and 0.30, and those of BFT with EMA, CW and YI were 0.12, 0.57 and 0.97, and those of EMA with CW and YI were 0.32 and 0.27, respectively. And genetic correlation of CW with YI was 0.62. Single trait selection for MS might lead to reducing BFT, but might be an obstacle to increase CW due to negative genetic correlations of MS with BFT and CW.
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