Journal of Animal Science and Technology

Korean Society of Animal Sciences and Technology (한국축산학회)
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Evaluation of Feed Values of Korean Straws Using Pressure Transducer

Auto-Pressure Transducer를 이용한 국내산 고간류의 사료가치평가

  • Lee, Sang S. (School of Agric. Biotechnol., Seoul National University) ;
  • Ha, J. K. (School of Agric. Biotechnol., Seoul National University) ;
  • Chang, M. B. (Animal Science & Technology, Chung-Ang University)
  • Published : 2003.04.30
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Abstract

Accurate and rapid evaluation of the nutritional quality of Korean straws is important because of the recent increase in the use of these feedstuffs in Korean. The aim of the study was to establish with relationships between ruminal fermentation of Korean straws and in vitro gas production using a pressure transducer. The pressure transducer system includes pressure censors, AD board, LED monitor, and the computer with real-time graphics. Both gas production and DM digestibility data were fitted into the exponential equation P = a + b (1-e-$1-e^{-ct}$). The initial rate of gas production was highest for rice straw, followed by barley straw and wheat straw. The gas production rate of constant (c) in gas production for rice straw, wheat straw, and barley straw were 3.8, 2.5, and 2.5 $%h^{－1}$, respectively. Total VFA concentration (mM) produced after 72h incubation was similar among three Korean straws, even though was variable during the early (12h) fermentation. Volume of gas production was related (P> 0.05: r = 0.76 to 0.83) to DM disappearance and also strongly related (p< 0.05: r = 0.91 to 0.98) to VFA concentration at all incubation times. Linear correlation showed between gas production and DM disappearance and VFA by in vitro will be matched in in vivo digestibility.

국내산 고간류의 영양학적 평가는 매우 중요하다. 본 연구는 압력센서를 이용하여 국내산 고간류의 가스발생량과 반추위발효산물과의 상관관계를 비교하고자 실시하였다. 가스발생량 측정장치는 압력센서, AD board, LED 모니터 및 real-time graphics가 설치된 컴퓨터로 구성되었다. 가스발생량과 건물소화율은 지수방정식 Pt = a + b ($1-e^{-ct}$)을 기초로 추정하였다.초기 가스발생량은 볏짚이 가장 높았으며 보리짚, 밀짚순이었다. 시간당 분해상수는 3.8, 2.5, 2.5%$h^{－1}$로서 볏짚, 보리짚, 밀짚순이었다. 전체 휘발성 지방산은 초기 12시간에 유의한 차이가 있었지만 배양 72시간 이후의 농도는 세 처리구에서 비슷한 결과를 나타냈다. 가스발생량과 건물소화율의 상관지수($r^2$)는 0.76-0.83으로 밀접한 관계가 있었으며 또한 휘발성지방산과 가스발생량의 상관지수는 0.91-0.98로 매우 밀접한 관계가 있었다. 따라서 가스발생량, 건물소화율 및 휘발성 지방산의 단일상관관계는 고간류의 in vivo 소화율에서도 유사할 것으로 보인다.

Keywords

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