Journal of Animal Science and Technology

Korean Society of Animal Sciences and Technology (한국축산학회)
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Interpretation of Protein Feed Degradation Pattern in Ruminant Using an Omasal Digesta Sampling Technique

제 3위 소화액 채취기법을 이용한 반추위 단백질 사료 분해 패턴 측정법의 고찰

  • Published : 2006.08.31
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Abstract

Present review is to introduce an omasal sampling technique in rumen proteolysis and to consider some information on the omasal sampling technique with particular emphasis on methodological aspects. Use of the omasal sampling technique provides a new opportunity for accurate estimation of rumen metabolism with overcoming limitations of previous in vivo, in vitro and/or in situ methods. The potential advantages of the present technique compared with post-ruminal sampling techniques include following points; 1) only rumen cannulated animals are required, 2) less endogenous nitrogen (N) is contaminated in omasal digesta and 3) omasal digesta are devoid of exposure to acid peptide hydrolysis occurring in the abomasum. Estimates of soluble non-ammonia N (SNAN) in omasal digesta indicate that the assumptions underlying the in situ method that rapidly degradable N fraction can be degraded at an infinite rate and only insoluble dietary N escapes the rumen may be not valid. Quatitatively higher peptide concentration rather than free amino acid and soluble protein in escapable SNAN suggests that hydrolysis of peptide to amino acid may be the rate-limiting step in rumen proteolysis.

제 3위 소화액 채취기법은 기존 반추위 영양생리 대사 패턴 측정방법인 in vivo, in vitro 및 in situ 방법의 단점을 극복하고 정확한 반추위 생리대사 패턴의 측정을 할 수 있는 기회를 가진다. 이 제 3위 소화액 채취기법을 이용한 측정방법은 기존의 post-ruminal sampling 기법과 비교해서 다음과 같은 장점들이 존재한다. 1) 단지 반추위캐뉼라가 설치된 동물만이 필요하며, 2) 제 3위 소화액에는 비교적 적은 내인성 질소가 존재하며, 3) 제 3위 소화액은 제 4위에서 시작되는 소화효소에 의한 소화를 피할 수 있는 점 등이다. 제 3위 소화액 내 반추위 미분해 용해성 질소화합물(SNAN)의 측정은 in situ 방법의 전제조건인 반추위에서 rapidly degradable N은 무한정 분해되며 따라서 비용해성 사료 N 만이 반추위를 벗어난다는 것이 오류임을 보여준다. 제 3위 소화액 내 SNAN 중 유리아미노산 및 용해성 단백질과 비교해서 양적으로 가장 많은 peptide는 반추위 단백질대사에서 peptide에서 아미노산으로의 분해과정이 분해율 제한요인이 될 수 있음을 시사한다.

Keywords

References

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