This study was carried out to investigate the effect of mountain grazing on growth performance and carcass characteristics of Hanwoo steers. Thirty two Hanwoo steers were randomly assigned. Control were fed concentrate + forage until 30 month of age. Treatment1 were fed concentrate + forage after mountain grazing from 8 to 13 months. Treatment2 and 3 were fed concentrate + forage after mountain grazing from 8 to 17 months. Hanwoo steers on Treatment 1 and 2 were slaughtered at the same age (30 months) as the control, and Hanwoo steers on Treatment 3 were slaughtered at 31 months. The average daily gain (ADG) were higher in the control than in the other treatments during the growing period (p<0.05). Carcass back fat thickness was thicker in the TRT 3 and marbling score was higher in the TRT 1 than in the other treatments; however, the differences were not statistically significant. There was no difference in the meat composition and shear force of the longissimus muscle according to the mountain grazing. However, the yellowness (b) of fat colors were significantly lower in the control than in the TRT 1 and TRT 2 (p<0.05). The effect of grazing on fatty acid composition was not constant. In conclusion, mountain grazing could reduce meat color without affecting the growth and meat quality of Hanwoo steers, and further research on the quality, yield and intake of grassland would be needed.

ABSTRACT
Ⅰ. 서 론
Ⅱ. 재료 및 방법
    1. 시험장소, 공시동물 및 시험기간
    2. 실험설계 및 사양관리
    3. 조사항목 및 분석방법
    4. 통계처리
Ⅲ. 결과 및 고찰
Ⅳ. 요 약
Ⅴ. 사 사
Ⅵ. REFERENCES

• 이은미(국립축산과학원 한우연구소) | Eun Mee Lee (Hanwoo Research Institute, National Institute of Animal Science)
• 정기용(한국농수산대학교) | Ki Yong Chung (Korea National College of Agriculture and Fisheries)
• 김의형(국립축산과학원 한우연구소) | Ui-Hyung Kim (Hanwoo Research Institute, National Institute of Animal Science)
• 안준상(국립축산과학원 한우연구소) | Jun Sang Ahn (Hanwoo Research Institute, National Institute of Animal Science)
• 박보혜(국립축산과학원 한우연구소) | Bo Hye Park (Hanwoo Research Institute, National Institute of Animal Science)
• 강동훈(국립축산과학원 한우연구소) | Dong Hun Kang (Hanwoo Research Institute, National Institute of Animal Science)
• 장선식(국립축산과학원 한우연구소) | Sun Sik Jang (Hanwoo Research Institute, National Institute of Animal Science) Corresponding author