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 Supplementary Feeding Levels on Productivity and Grazing Intensity in Grazing Elk stags(Cervus canadensis)

보충사료 급여수준이 엘크 수사슴의 생산성 및 방목강도에 미치는 영향

  • Lee, Jinwook (Animal Genetic Resources Research Center, National Institute of Animal Science, RDA) ;
  • Lee, Sang Hoon (Animal Genetic Resources Research Center, National Institute of Animal Science, RDA) ;
  • Lee, Sung Soo (Animal Genetic Resources Research Center, National Institute of Animal Science, RDA) ;
  • Jeon, Dayeon (Animal Genetic Resources Research Center, National Institute of Animal Science, RDA) ;
  • Kim, Sung Woo (Animal Genetic Resources Research Center, National Institute of Animal Science, RDA) ;
  • Yun, Yeong Sik (Institute of Livestock Environmental Management) ;
  • Kim, Sang Woo (International Agricultural Development and Cooperation Center, Chonbuk National University) ;
  • Park, Hyung Soo (Animal Genetic Resources Research Center, National Institute of Animal Science, RDA) ;
  • Kim, Kwan Woo (Animal Genetic Resources Research Center, National Institute of Animal Science, RDA)
  • 이진욱 (농촌진흥청 국립축산과학원) ;
  • 이상훈 (농촌진흥청 국립축산과학원) ;
  • 이성수 (농촌진흥청 국립축산과학원) ;
  • 전다연 (농촌진흥청 국립축산과학원) ;
  • 김성우 (농촌진흥청 국립축산과학원) ;
  • 윤영식 (축산환경관리원) ;
  • 김상우 (전북대학교 국제농업개발협력센터) ;
  • 박형수 (농촌진흥청 국립축산과학원) ;
  • 김관우 (농촌진흥청 국립축산과학원)
  • Received : 2019.03.07
  • Accepted : 2019.05.01
  • Published : 2019.06.30
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Abstract

This study was conducted to investigate the effect of supplementary feeding levels on livestck and forage productivity and grazing intensity in Elk stags (Cervus canadensis). A fifteen 2-year-old Elk stags about 195 kg were randomly assigned to one of three dietary treatments (five animals per treatment). The dietary treatments consisted of a feeding concentrate of 1.0% of body weight (T1), 1.5% of body weight (T2) and 2.0% of body weight. Total dry matter intake (TDMI) was increased with increased with an increasing supplementary feeding levels. Average daily gain (ADG) were significantly increased with an increasing supplementary feeding levels (p<0.05) and reached a maximum on July and was lower in spring than autumn. The velvet antler production was no differences among treatment groups. Forage productivity of pasture and crude protein content were highest on May and decreased thereafter, however, crude fiber content was the reversed. The grazing intensity of Elk stags was increased in spring (38 to 59 head per ha) than summer and autumn (13 to 32 head per ha). The average grazing intensity of Elk stags ranged from 21 to 34 head per ha, which is affected by supplementary feeding levels. This result suggests that feeding supplementary diet at 1.5 % of body weight was needed to maintain the stable wight gain in antler growing periods and control the proper grazing intensity of Elk deer stags.

본 연구는 엘크 수사슴의 방목 시 보충사료 급여수준에 따른 생산성 변화와 적정 방목강도 구명을 통하여 초지활용성을 향상시키고 사슴 방목에 대한 기초자료를 제공하기 위하여 수행되었다. 공시가축은 평균체중 195kg의 2년생 엘크(Cervus canadensis) 수사슴 15두를 공시하였으며, 보충사료 급여수준에 따라 3개의 처리구(체중의 1.0%(T1), 체중의 1.5%(T2), 체중의 2.0%(T3))에 완전임의배치를 하였다. 실험기간동안 건물섭취량과 일당증체량은 보충사료 급여수준이 높을수록 유의적으로 높게 나타났다. 월별 건물섭취량과 증체량은 봄부터 여름까지 증가하다 가을로 들어서면서 감소하는 일반적인 사슴의 섭식패턴과 유사하게 나타났다. 그러나 뿔 성장기 보충사료 급여수준이 낮을 경우 녹용성장기에 성장지연의 문제가 발생하는 것으로 나타났다. 녹용생산성의 경우 영양수준과의 연관성이 낮은 것으로 나타났다. 방목초지의 사초생산성은 5월에 가장 높았고 8월 이후 급격히 감소하는 것으로 나타났으며, 산야초를 활용한 산지방목에 비해서 조단백질 함량이 높게 나타났다. 엘크 수사슴의 월별 적정 방목강도는 사초생산성이 높은 5~6월에 보충사료 급여수준에 따라 38~59 두/ha로 높게 나타났고, 7월 이후에는 13~32 두/ha로 낮게 나타났다. 또한, 보충사료 급여수준이 증가할수록 사초섭취량이 감소하여 방목강도가 높아지는 것으로 나타났다. 본 연구의 결과로 엘크 수사슴의 방목 시 녹용성장기 성장지연을 예방하고 방목 시 안정적인 증체량을 유지하기 위해서는 보충사료를 체중의 1.5%이상 급여하는 것이 필요하다고 사료되며, 초지의 활용성을 향상시키기 위해서 사초 생산성을 고려하여 적정 방목강도의 조절이 필요한 것으로 판단된다.

Keywords

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