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 Temperature and Time for Heating and Filler Content on the Activities of Xylanase, Cellulase and Amylase in Slaughterhouse Rumen Content

가열온도, 가열시간 및 부형제의 첨가량이 도축 반추위 내용물의 자일란, 셀룰로오스 및 전분 분해효소 활성에 미치는 영향

  • Won, Mi Young (Department of Animal Science, Kyungpook National University) ;
  • Lee, Do Hyung (Department of Animal Science, Chonbuk National University) ;
  • Kim, Eun Joong (Department of Animal Science, Kyungpook National University)
  • Received : 2013.02.01
  • Accepted : 2013.02.20
  • Published : 2013.03.31
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Abstract

This study was conducted in order to develop slaughterhouse rumen content (SRC) as a potential feed additive. The moisture content of SRC can reach 80%, and therefore an appropriate dewatering process is required before it can be used. In this study, the effects of heating temperature, heating time, and filler content during the dewatering process on the activity of various enzymes in SRC were investigated. The Box-Behnken experimental design was employed, involving a total of 45 experimental runs, consisting of three variables (heating time, heating temperature, and filler content) with three levels per variable (12, 30 and 48 hr; 60, 75 and $90^{\circ}C$; 12, 22.5 and 33% for heating time, heating temperature, and filler content, respectively). For enzyme activities, xylanase, cellulase, and amylase were examined, and the results were subjected to an analysis of variance. Heating time, heating temperature and filler content had significant effects on the activity of each enzyme (p<0.05). Cellulase and amylase activities decreased (p<0.05) at elevated heating temperatures, whereas xylanase was reasonably stable around $90^{\circ}C$. The activities of all enzymes decreased (p<0.05) with increased heating time. Optimum filler contents for xylanase, cellulase, and amylase activities were 22.5, 12 and 33%, respectively. However, optimum conditions for all variables that simultaneously maximize the activity of all three enzymes could not be ascertained in this study. Nevertheless, the results from the current study can be useful as basic information for the development of SRC as a feed additive enriched with improved major enzymes for livestock feed digestion.

본 연구는 도축장에서 폐기되는 도축 반추위 내용물을 사일리지 혹은 TMR (total mixed ration) 사료 첨가용 효소제로 개발하기 위한 목적으로 수행되었다. 도축 반추위 내용물에는 상당한 수분이 함유되어 있어, 적절한 건조과정을 거치지 않고서는 그 활용이 원활하지 않다. 그러나 효소는 열에 민감한 단백질로 구성되어 있기 때문에 적절한 건조 조건의 개발이 필요하다. 본 연구에서는 통계적 방법을 이용하여 가열온도(60, 75, $90^{\circ}C$), 가열시간(12, 30, 48 시간) 및 부형제의 비율(12, 22.5, 33%)이 도축 반추위 내용물에 함유된 다양한 효소활성에 미치는 효과를 분석하였다. 총 3가지 효소, xylan 분해효소, 셀룰로오스 분해효소 및 전분 분해효소를 검토하였고, 각 효소활성들에 대한 각 요인들의 효과가 매우 다양하게 나타났다(p<0.05). 셀룰로오스 분해효소와 전분 분해효소의 활성은 가열온도가 증가함에 따라 감소하였으며(p<0.05), xylan 분해해소는 열에 대한 안전성이 다른 효소들에 비하여 우수하였다. 자일란, 셀룰로오스, 전분 분해효소를 증가시키는 적정 부형제의 비율은 22.5, 12 그리고 33%로 나타났다. 비록 3가지 효소들의 제형화에 있어 공통적으로 적용될 수 있는 최적점을 도출하지는 못하였으나, 본 연구결과에서 얻어진 효소들의 반응 값들을 이용하여 목적하는 효소에 따라서 다양한 방법으로 적용이 가능할 것으로 판단된다.

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References

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