This study was conducted to investigate the effects of feeding DDGS and full-fat soybean in the finishing diet on the performance, carcass characteristics and unsaturated fatty acid composition of Hanwoo steers. Thirty Hanwoo steers (average age, 26.4 months; weight, 756.69 kg) were assigned into Control (no additive), DS (DDGS supplemented) and FS (full-fat soybean supplemented). The feeding rate of DDGS and full-fat soybean was set at 10% and 5% in the finishing diet, respectively, and the in vivo trial was conducted for 122 days. The final body weight was 779.81, 774.20 and 791.95 kg for Control, DS and FS, respectively, and the average daily gain was not different among treatments. The feed conversion ratio was lower in FS compared to Control. Carcass cold carcass weight, backfat thickness, M. longissimus dorsi area and marbling scores were not different among treatments, and moisture, crude protein, and crude fat content in carcass were not different. The melting point of sirloin ranged from 25 to 26℃ among treatments. The saturated fatty acid, C18:0, was lower in the FS than in Control. C18:1, the main unsaturated fatty acid (UFA) in carcasses, did not show any difference among treatments, but C18:2 was higher in DS than in Control. Total UFAs were higher in the FS than in Control. Based on the above results, DDGS feeding was effective in improving feed conversion ratio and C18:2 content, and full-fat soybean feeding was effective in improving feed conversion ratio and increasing UFA content.

본 연구는 DDGS의 첨가가 거세한우의 비육성적, 도체특성 및 지방산조성에 미치는 영향을 조사하기 위해서 실시되었다. 평균 28.2개월령 (평균 체중 747.1±62.8㎏)의 거세한우 44두를 대조구, 시험1구 (DDGS 15% 첨가구) 및 시험2구 (DDGS 30% 첨가구)에 각각 15, 14 및 15두씩 배치하여 84일간 사양시험을 실시하였다. 일당증체량은 처리구별 유의적인 차이가 나타나지 않았다. 사료요구율은 시험1구와 시험2구가 대조구에 비하여 각각 9.3%과 17.1% 낮게 나타났다. 도체성적의 경우 등지방두께와 등심단면적은 처리구별 차이가 나타나지 않았다. 처리구별 육질등급별 출현율은 1++등급 출현율은 시험1구 (42.9%)에서 가장 높았고, 시험2구 (26.7%)에서 가장 낮게 나타났다. 도체등심의 지방산 조성은 불포화지방산 함량은 시험1구가 시험2구에 비하여 유의적 (P<0.05)으로 높게 나타났으며, C18:2 (linoleic acid) 및 다가 불포화지방산은 시험1구 및 시험2구에서 유의하게 (P<0.05) 높게 나타났다. 이상과 같은 결과를 종합해 보면, 거세한우의 비육후기에 DDGS 15% 급여한 시험1구에서 사료요구율, 육질등급 및 불포화지방산 함량 증가에 효과적인 것으로 나타났다.