Korean Journal of Veterinary Service (한국동물위생학회지)

The Korean Society of Veterinary Service (한국동물위생학회)
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Characteristics of digestive enzyme activity, antibiotic resistance, and pathogenicity of bacteria inhabited in animal feed resources

사료자원에 서식하는 세균의 소화효소활성, 항생제내성 및 병원성에 관한 특성

  • Yi, Kwon Jung (Department of Animal Science and Technology, Konkuk University) ;
  • Cho, Sang Seop (Yangjucity Agricultural Technology Center) ;
  • Kim, Soo-Ki (Department of Animal Science and Technology, Konkuk University)
  • 이권정 (건국대학교 동물자원과학과) ;
  • 조상섭 (양주시농업기술센터) ;
  • 김수기 (건국대학교 동물자원과학과)
  • Received : 2017.06.03
  • Accepted : 2017.06.27
  • Published : 2017.06.30
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Abstract

Among different types of spoilage, microbial contamination can cause feed decomposition, which results in decreases in feed intake and productivity, infection, and breeding disorder. During the storage time, various microbes have a chance to inoculate with depreciation of feed and to infect the animals. We investigated bacteria that inhabit diverse feed ingredients and complete feed which have been stored for a few months. We isolated and identified 30 genera and 62 species of bacteria. Among these 62 species, 21 species were of non-pathogenic bacteria, 18 species were of pathogenic bacteria, 9 species were of opportunistic pathogens, and 14 species were of unknown bacteria. Pantoea allii and 24 species showed proteolytic enzyme activity. We also confirmed that 6 species including Pseudomonas psychrotolerans showed ${\alpha}$-amylase activity, and 29 species including Burkholderia vietnamiensis showed cellulase activity. Microbacterium testaceum and 3 species showed resistance to Ampicillin, Kanamycin, Streptomycin, Gentamicin, Carbenicillin, and Erythromycin ($50{\mu}g/mL$). Using mealworm larvae (Tenebrio molitor L.) as a model for pathogenicity, we confirmed that 8 species including Staphylococcus xylosus had pathogenicity for mealworm larvae. Especially, Enterobacter hormaechei, Staphylococcus xylosus, and Staphylococcus hominis were reported as being pathogenic for humans. This research suggests that hygienic management of animal feed is essential because beneficial and harmful bacteria can inhabit animal feed differently during storage and distribution.

Keywords

References

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