Earticle

초록

영어

This study was conducted to investigate the effects of supplementation of direct-fed microbials (DFMs) during the growing and finishing periods on growth performance and carcass characteristics in Hanwoo steers. DFMs were administered only during the first 3 months after arrival and the final 3 months before slaughter, and the feeding trial lasted for 740 days. During the growing phase, the treatment group showed a significantly higher average daily gain (ADG) of 0.89 kg compared to 0.80 kg in the control group (p<0.05). No significant differences were found between groups during the fattening phase. In the finishing phase, ADG was significantly higher in the treatment group (0.59 kg vs. 0.53 kg; p<0.05), although concentrate intake increased by 6.17% without statistical significance. At the end of the entire feeding period, the treatment group had a higher final body weight (803.05 kg vs. 763.51 kg), and overall ADG was significantly greater (p<0.05). For carcass traits, cold carcass weight was significantly higher in the treatment group (p<0.05), while no significant differences were observed in backfat thickness, loin eye area, or marbling score. However, the proportion of carcasses graded 1++ was higher in the treatment group (50.0%) than in the control group (30.0%). In conclusion, supplementation of direct-fed microbials during the growing and finishing periods improved average daily gain and increased the proportion of carcasses with higher quality grades in Hanwoo steers.

목차

ABSTRACT
Ⅰ. 서론
Ⅱ. 재료 및 방법
1. 시험동물 및 시험설계
2. 시험사료
3. 시험재료 및 급여방법
4. 사료급여 프로그램 및 사양관리
5. 도체 특성 조사
Ⅲ. 결과 및 고찰
1. 육성기의 비육능력
2. 비육 전기의 비육능력
3. 비육 후기의 비육능력
4. 전기간의 비육능력
5. 도체성적
Ⅳ. 요약
Ⅴ. 참고문헌

저자

• 김성일 [ Sung Il Kim | 국립경국대학교 동물생명공학과 교수 ] Corresponding Author

참고문헌