Journal of The Korean Society of Grassland and Forage Science (한국초지조사료학회지)

The Korean Society of Grassland and Forage Science (한국초지조사료학회)
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Effect of Mountain Grazing on Growth Performance and Carcass Characteristics of Hanwoo Steers

산간지 방목이 거세한우의 성장특성 및 도체형질에 미치는 영향

  • Lee, Eun Mee (Hanwoo Research Institute, National Institute of Animal Science) ;
  • Chung, Ki Yong (Korea National College of Agriculture and Fisheries) ;
  • Kim, Ui-Hyung (Hanwoo Research Institute, National Institute of Animal Science) ;
  • Ahn, Jun Sang (Hanwoo Research Institute, National Institute of Animal Science) ;
  • Park, Bo Hye (Hanwoo Research Institute, National Institute of Animal Science) ;
  • Kang, Dong Hun (Hanwoo Research Institute, National Institute of Animal Science) ;
  • Jang, Sun Sik (Hanwoo Research Institute, National Institute of Animal Science)
  • 이은미 (국립축산과학원 한우연구소) ;
  • 정기용 (한국농수산대학교) ;
  • 김의형 (국립축산과학원 한우연구소) ;
  • 안준상 (국립축산과학원 한우연구소) ;
  • 박보혜 (국립축산과학원 한우연구소) ;
  • 강동훈 (국립축산과학원 한우연구소) ;
  • 장선식 (국립축산과학원 한우연구소)
  • Received : 2019.11.18
  • Accepted : 2019.12.06
  • Published : 2019.12.31
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Abstract

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.

본 연구는 산간지 방목이 거세한우의 성장특성 및 도체형질에 미치는 영향을 조사하기 위해 수행되었다. 시험구 배치는 육성기부터 출하시까지 일반 비육프로그램(30개월)으로 사육되는 대조구(Control)와 육성기부터 5개월간 방목후 30개월에 출하되는 처리구(TRT 1), 육성기부터 9개월 방목후 30개월에 출하되는 처리구(TRT 2) 및 육성기부터 9개월 방목 후 31개월에 출하되는 처리구(TRT 3)로 4처리 하였으며, 처리구당 한우 거세우 8두씩 배치하였고, 모든 방목 처리구는 방목기간 이후에 출하시까지 일반 비육프로그램으로 전환하여 사육하였다. 출하시 종료체중은 대조구에서 가장 높았으며, 육성기간 동안의 일당증체량도 모든 방목 처리구에 비해 대조구에서 유의적으로 높게 나타났다(p<0.02). 도체중은 대조구에서 가장 높았고, 등지방두께는 TRT 3에서 두꺼운 경향을 보였지만 처리간 통계적인 차이는 없었다. 근내지방도는 방목에 따른 일관적인 경향 없이 TRT 2에서 가장 높게 나타났으며, 등심의 일반성분 및 전단력은 방목에 영향을 받지 않았다. 육색의 명도, 적색도 및 황색도의 처리간 차이는 없었지만, 지방의 황색도는 대조구 보다 TRT 1 및 TRT 2에서 높게 나타났다(p<0.02). 방목기간이 등심의 지방산 조성에 미치는 영향은 일정하지 않았다. 따라서, 산간지 방목은 거세한우의 성장과 육질에 미치는 영향없이 육색을 저하시킬 수 있을 것으로 판단되며, 향후 초지의 품질, 생산량 및 섭취량에 대한 추가 연구가 필요할 것으로 사료된다.

Keywords

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