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

The Korean Society of Grassland and Forage Science (한국초지조사료학회)
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Effects of Extruded Linseed Supplementation on Methane Production in Holstein Steers

Extruded linseed 첨가가 홀스타인 거세우 장내발효 메탄발생량에 미치는 효과

  • Woo, Yang Won (Graduate School of International Agricultural Technology, Seoul National University) ;
  • Lee, Chang Hyun (Department of Animal Science and Technology, Konkuk University) ;
  • Rajaraman, Bharanidharan (Institute of Green Bio Science & Technology, Seoul National University) ;
  • Yeo, Joon Mo (Dept. of Beef & Dairy Science, Korea National College of Agriculture & Fisheries) ;
  • Lee, Won Young (Dept. of Beef & Dairy Science, Korea National College of Agriculture & Fisheries) ;
  • Kim, Do Hyung (Department of Animal Science, Gyeongbuk Provincial College) ;
  • Jang, Seon-Sik (Hanwoo Research institute, National Institute of Animal Science) ;
  • Kim, Kyoung Hoon (Graduate School of International Agricultural Technology, Seoul National University)
  • 우양원 (서울대학교 국제농업기술대학원) ;
  • 이창현 (건국대학교 동물자원과학과) ;
  • ;
  • 여준모 (국립한국농수산대학 대가축학과) ;
  • 이원영 (국립한국농수산대학 대가축학과) ;
  • 김도형 (경북도립대학교 축산과) ;
  • 장선식 (국립축산과학원 한우연구소) ;
  • 김경훈 (서울대학교 국제농업기술대학원)
  • Received : 2017.09.25
  • Accepted : 2017.11.12
  • Published : 2017.12.31
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Abstract

The present experiment was designed to investigate the effects of extruded linseed supplementation on methane production in Holstein steers. Four Holstein steers fitted with permanent cannulas were assigned to two dietary treatments in a duplicated $2{\times}2$ Latin square design: a control diet consisting of tall fescue straw (65%) and concentrate (35%), and a treatment diet supplemented with 3.8% extruded linseed by replacing a part of ingredients in the concentrate of the control diet. The concentrates of the control and the treatment diet were isoenergetic and isonitrogenous. Extruded linseed supplementation did not affect dry matter intake but significantly (P<0.05) increased the intake of lipid. Rumen pH was significantly (P<0.05) lower for control than for treatment. Although there was no significant difference between treatments, the concentration of total VFA in control was 21% higher than in treatment. The concentrations of acetic acid, propionic acid and butyric acid were not different between treatments. Extruded linseed supplementation significantly (P<0.05) reduced methane output(g/d) and emission factor. Methane conversion rate was lower for treatment than for control but no significant difference was found. The results of the present study showed that extruded linseed supplementation in the diet of Holstein steers could reduce methane output.

본 연구는 지방함량이 높은 원료인 extruded linseed가 홀스타인 거세우의 메탄배출량에 미치는 영향을 조사하기 위해 수행하였다. 반추위 캐뉼라가 장착된 홀스타인 거세우 4두 ($462{\pm}30kg$)를 duplicated $2{\times}2$ Latin square design에 배치하여 실험을 수행하였다. 대조구는 육우용 시판 배합사료와 tall fescue 짚을 65:35의 비율로 혼합하여 체중의 2.8%(원물기준)에 해당하는 양을 급여하였다. 처리구는 대조구의 배합사료 총 에너지와 CP 수준을 동일하게 유지하되 원료 일부를 extruded linseed 3.8%로 대체하여 급여하였다. Extruded linseed 첨가는 건물섭취량에 영향을 미치지 않았지만 지방섭취량은 대조구에 비하여 유의성 있게 증가시켰다(P<0.05). 처리구간 반추위 pH는 비교적 적은 차이었지만 대조구가 extruded linseed 첨가구에 비하여 유의적으로 낮았다(P<0.05). 총 VFA의 농도는 대조구가 extruded linseed 첨가구에 비하여 21%정도 높았지만 통계적 유의성은 없었다. 초산, 프로피온산 및 낙산의 농도도 처리구간 유의적인 차이가 없었다. Extruded linseed의 첨가는 1일 메탄 발생량과 메탄 배출계수(emission factor)를 15%정도 유의성 있게 감소시켰다(P<0.05). 건물, 유기물, NDF의 섭취 1kg당 메탄발생량 및 메탄전변율에서는 extruded linseed 첨가구가 대조구에 비하여 낮은 수준이었지만, 통계적 유의성은 나타나지 않았다. 본 실험은 우리나라의 사료급여환경에서 홀스테인 거세우에게 extruded linseed 급여한 첫 실험으로서 메탄생성량을 감소시킬 수 있다는 가능성을 보여주고 있다.

Keywords

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