Korean Journal of Organic Agriculture (한국유기농업학회지)

Korean Association of Organic Agriculture (한국유기농업학회)
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Optimum Forage Sources and Its Ratio in TMR for Environmently-friendly Goat Feeding: In vitro Rumen Fermentation Study

친환경 흑염소 사양을 위한 최적 조사료 초종 및 TMR 혼합비 비율: In vitro 반추위 발효 연구

  • 류채화 (전북대학교 축산학과) ;
  • 이진욱 (국립축산과학원 가축유전자원센터) ;
  • 김관우 (국립축산과학원 가축유전자원센터) ;
  • 이성수 (국립축산과학원 가축유전자원센터) ;
  • 박혜련 (전북대학교 축산학과) ;
  • 전은정 (전북대학교 축산학과) ;
  • 박명선 (전북대학교 축산학과) ;
  • 최낙진 (전북대학교 동물자원과학과)
  • Received : 2020.06.05
  • Accepted : 2020.07.06
  • Published : 2020.11.30
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Abstract

This study was conducted to investigate the effects of TMR on in vitro rumen fermentation and methane production of goat with different forage sources. The experiment was arranged 4×2 factorial design. The different forage sources were rice straw (RS), Italian rye grass (IR), timothy (TI) and alfalfa (AL), respectively. There were two different forage : concentrate ratios such as 20:80 (20) and 50:50 (50), respectively. Therefore, totally 8 treatments were used: 1) RS20, 2) RS50, 3) IR20, 4) IR50, 5) TI20, 6) TI50, 7) AL20, and 8) AL50, respectively. The rumen fluid of goat was collected from the slaughterhouse. For fermentation parameters, ruminal pH, total gas, methane, hydrogen, ammonia nitrogen, and volatile fatty acid were determined. The pH values were within an optimal range across all treatments. Total gas productions at TI20 and AL50 were significantly greater than others (p<0.05). Methane production was significantly lower in TI and AL compared with other treatments (p<0.05). The relatively high dietary NDF content in treatments showed significantly lower methane production (p<0.05). Significant alterations treatments were detected at ammonia nitrogen concentration according to the ratio of forage : concentrate (p<0.05). AL treatment showed greater total volatile fatty acid production compared with other treatments (p<0.05). Therefore, the present study suggests that both Timothy and Alfalfa could be recommendable forage sources for goat based on results with volatile fatty acid as an energy source and methane as an index for energy loss and environmental issues. Also, the 50:50 (forage : concentrate) ratio would prefer to 20:80.

Keywords

Acknowledgement

본 논문은 농촌진흥청 연구사업(세부과제명: 염소 장내발효 메탄배출량에 영향을 미치는 메탄생성균 다양성 조사, 세부과제번호: PJ01360702) 및 2020년도 농촌진흥청 국립축산과학원 전문연구원 과정 지원사업에 의해 이루어진 것임.

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