Journal of Animal Science and Technology

Korean Society of Animal Sciences and Technology (한국축산학회)
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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
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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.

본 연구는 비육후기 사료 내 미강과 볶은 대두의 첨가가 거세한 우의 도체특성과 CLA 함량에 미치는 영향을 조사하고자 실시되었다. 평균 20.92 개월령 (평균체중 599.89 kg)의 거세한우 36두를 대조구, 미강 첨가구 및 볶은대두 첨가구로 나누고 각각의 처리구는 12두씩 체중과 월령을 고려하여 배치하였다. 미강과 볶은 대두의 첨가 수준은 시험사료 내 조지방 함량을 5%로 설정하고, 조지방 부족분을 각각의 첨가원료 (미강과 볶은 대두)로부터 보충 되도록 설계하여 314일 동안 비육시험을 실시하였다. 종료 시 체중은 대조구, 미강 첨가구 및 볶은대두 첨가구가 각각 754.58, 783.33 및 755.67 kg으로 나타났다. 일당증체량은 미강 첨가구 (0.57 kg), 볶은대두 첨가구 (0.50 kg) 및 대조구 (0.50 kg) 순으로 나타났으나, 처리구별 유의적인 차이는 없었다. 사료요구율의 경우 미강 첨가구가 대조구와 볶은대두 첨가구에 비하여 각각 14.5%와 12.8% 더 낮아진 것으로 나타났다. 도체의 육량형질과 육질형질은 처리구별 유의적인 차이는 없었지만, 육질등급 $1^{{+}{+}}$ 등급 출현율은 볶은대두 첨가구 (50.0%)가 대조구 (33.33%)와 미강 첨가구 (25.0%)에 비하여 높은 출현율을 보였으며, $1^+$ 이상 등급 출현율에서도 볶은대두 첨가구 (75.0%)가 미강 첨가구 (66.67%)와 대조구 (41.66%)에 비하여 높게 나타났다. 체지방 부위별 c9, t11 CLA는 신장지방에서 볶은대두 첨가구 (0.21%)가 미강 첨가구 (0.15%)와 대조구 (0.16%)에 비하여 유의적 (p<0.05)으로 높게 나타났으며, 등심지방의 경우에도 볶은대두 첨가구 (0.21%)가 대조구 (0.16%)에 비하여 유의적 (p<0.05)으로 높게 나타났다. 체지방 부위별 t10, c12 CLA 함량은 등심지방에서 볶은대두 첨가구가 대조구에 비하여 유의적 (p<0.05)으로 낮게 나타났다. TVA 함량은 신장지방에서 볶은대두 첨가구 (2.56%)가 대조구 (2.27%)에 비하여 유의적 (p<0.05)으로 높게 나타났다. 피하 및 등심지방의 TVA 함량은 볶은대두 첨가구가 대조구에 비하여 각각 15.09와 6.92% 증가되었지만, 처리구별 유의적인 차이는 나타나지 않았다. 이상과 같은 연구 결과들을 종합해 보면 거세한우의 비육후기에 미강의 첨가는 사료요구율이 개선되었고, 볶은대두의 첨가는 도체등심 내 CLA 함량이 증가되었다.

Keywords

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