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Effects of Supplementary Rice Bran and Roasted Soybean in the Diets on Carcass Characteristics and Composition of CLA in Hanwoo Steers

사료 내 미강과 볶은 대두 첨가가 거세한우의 도체특성과 CLA 함량에 미치는 영향

  • Kim, Sung Il (Departement of Animal Science, Gyeonguk Provincial College) ;
  • Lee, Gwang Ho (Department of Statistics, College of Sciences, Yeungnam University) ;
  • Choi, Chang Bon (School of Biotechnlogy, Yeungnam University)
  • Received : 2013.04.24
  • Accepted : 2013.10.14
  • Published : 2013.10.31

Abstract

This study investigated the carcass characteristics and conjugated linoleic acid (CLA) content in Hanwoo steers that received supplementary rice bran (Rice bran group) and roasted soybeans (Roasted soybean group) into their finishing concentrates. The final body weight was 754.58, 783.33, and 755.67 kg, and the average daily gain was 0.50, 0.57, and 0.50 kg for the Control, Rice bran, and Roasted soybean group, respectively, showing no statistical differences. Feed requirements for the Rice bran group were 14.5% higher than the Control and 12.8% higher than the Roasted soybean group. No statistical differences were found in indices for carcass yield and quality grade between the groups. The composition of c9, t11 CLA in perirenal fats was significantly higher in the Roasted soybean group (0.21%) compared to the Rice bran group (0.15%) and Control (0.16%) groups (p<0.05). The composition of c9, t11 CLA in the M. Longissimus dorsi was also higher in the Roasted soybean group (0.21%) compared to the Control (0.16%) group. The composition of t10, c12 CLA in the M. Longissimus dorsi was statistically lower in the Roasted soybean group compared to the Control group (p<0.05). In perirenal fats, the composition of t11 trans-vaccenic acid (TVA) was significantly (p<0.05) higher in the Roasted soybean group compared to the control group. The TVA composition in the Roasted soybean group increased to 15.09 and 6.92%, respectively, in subcutaneous and M. Longissimus dorsi fats comparing to the Control group, without statistical differences between the treatment groups. In conclusion, rice bran is beneficial for improving feed efficiencies, while roasted soybeans are effective for increasing CLA in the M. Longissimus dorsi of Hanwoo steers.

Keywords

Rice bran;Roasted soybean;Conjugated linoleic acid(CLA);Hanwoo steers;TVA

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