Journal of Animal Science and Technology

Korean Society of Animal Sciences and Technology (한국축산학회)
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Studies on Isolation and Characterization of Anaerobic Bacteria from Gut of Holstein Cows and Korean Male Spotted Deer

꽃사슴과 Holstein 젖소의 장내 혐기성 박테리아의 분리 및 특성

  • 박소현 (한경대학교 낙농과학과) ;
  • 이기영 (한경대학교 생물정보통신전문대학원) ;
  • 안종호 (한경대학교 낙농과학과) ;
  • 장문백 (중앙대학교 동물자원과학과) ;
  • 김창현 (한경대학교 동물생명자원학과)
  • Published : 2006.02.28
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Abstract

The purpose of this study was to isolate cellulolytic and hemicellulolytic anaerobic bacteria inhabiting from gut of ruminants and investigate their hydrolytic enzyme activities. Extracellular CMCase activities of H-strains isolated from the rumen of a Holstein dairy cow were higher than those of D- and DC- strains from the rumen and large intestine of Korean spotted deer. Most isolated bacteria utilized more efficiently Dehority's artificial medium containing starch, glucose and cellobiose (DAS) than those in Dehority's artificial medium containing cellulose only (DAC). The results of biochemical reactions and sugar fermentation indicated that the isolated bacteria belong to one of bacterial strains of Peptostreptococcus spp., Bifidobacterium spp., Prevotela ruminicola/buccae, Clostridium beijer/butyricum and Streptococcus intermedis which are not highly cellulolytic. Activities of Avicelase, xylanase, β-D-glucosidase, α-L-arabinofuranosidase and β-xylosidase of the isolated anaerobic bacteria in DAS were higher than those in DAC. In conclusion, the results indicated the higher enzyme activities of the isolated strains cultured in DAS medium were mainly caused by their specific carbohydrate utilization for enzyme production and growth rate. The highly cellulolytic bacteria were not isolated in the present experiment. Thus further research is required to investigate characteristics of gut bacteria from Korean spotted deer.

본 연구는 꽃사슴과 Holstein 젖소의 반추위와 대장에 서식하는 미생물중 섬유소 분해력이 강한 혐기성 박테리아를 순수 분리하여 분리된 미생물들을 동정하고 이들 미생물들의 효소 특성을 구명하고자 수행되었다. 배지의 종류에 관계없이 젖소에서 분리된 박테리아가 꽃사슴에서 분리된 미생물에 비하여 섬유소 분해효소 활력이 우수하였고 탄소 공급원의 종류에 의해 섬유소 분해 효소의 활력에 영향을 미쳤으며 특히, cellulose 단독 공급시 보다 starch, glucose와 cellobiose를 복합한 탄소 공급원을 제공시 일반적으로 높은 효소의 활력을 나타내었다. API kit를 이용한 생화학 및 당발효 시험 결과 알려진 강력한 섬유소 분해 박테리아는 동정되지 않았고 대부분의 박테리아가 Peptostreptococcus spp., Bifidobacterium spp., Prevotela ruminicola/buccae, Clostridium beijer/butyricum 및 Streptococcus intemedis로 동정되었다. 분리된 균들의 다당류 및 단당류를 분해할 수 있는 가수분해 효소인 Avicelase, xylanase, β-D-glucosidase, α-L-arabino- furanosidase 및 β-xylosidase의 효소활력은 이용하는 배지조성 특히 탄소 공급원의 종류에 의하여 효소의 활력에 영향을 미치며 가수분해 효소의 종류에 따라 각 분리된 균주들마다의 다른 분포를 나타내었다. 결론적으로 분리된 혐기성 박테리아들이 공급되는 탄수화물 기질의 종류에 따라 효소의 활력에 변화를 일으켰고 이것은 기질에 따른 박테리아의 효소생산 특이성과 성장률의 변화에서 기인하였기 때문이다.

Keywords

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