Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Effect of Synbiotics-Added Feeds on the Growth, Non-Specific Immune Response, and Disease Resistance of Olive Flounders, Paralichthys olivaceus

Synbiotics 첨가 사료 투여가 넙치(Paralichthys olivaceus)의 성장과 비특이적 면역 반응 및 세균성 감염 폐사에 미치는 영향

  • Chae-Yun, Moon (Department of Aquatic Life Medicine, Jeju National University) ;
  • Hong-Ju, Son (Department of Life Science and Environmental Biochemistry, Pusan National University) ;
  • Moon-Soo, Heo (Department of Aquatic Life Medicine, Jeju National University)
  • 문채윤 (제주대학교 해양과학대학 수산생명의학과) ;
  • 손홍주 (부산대학교 생명환경화학과) ;
  • 허문수 (제주대학교 해양과학대학 수산생명의학과)
  • Received : 2022.06.27
  • Accepted : 2022.07.20
  • Published : 2022.09.28
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Abstract

In this study, the effect of a synbiotic mixture of probiotics and 3% inulin on the growth, non-specific immune response, and mortality due to disease resistance of Paralichthys olivaceus was investigated. The results revealed that an 8-week diet of synbiotic-added feed, had no significant effect on the growth of P. olivaceus, Analysis of the hematological parameters revealed that there was a significant difference in the content of AST, total protein, and cholesterol among the groups, whereas there was no significant difference in the ALT and glucose contents. Further, there was no significant difference in the lysozyme activity of the synbiotic and control group after 8 weeks' feeding. In addition, when the symbiotic mixture was used rather than probiotics alone, the NBT activity of the synbiotic group increased compared to that of the control group. Moreover, when only probiotics were used, the cytokine expression in the spleen of the samples was significantly lower than that in the control group, whereas the expression was significantly higher in the spleen of the synbiotics group. However, there was no significant difference in the cytokine expression in the liver, intestine, and kidney of the three groups. Lastly, after injection for 2 weeks, the mortality rates of the control group towards Edwardsiella tarda, Streptococcus parauberis, and Streptococcus iniae were 95, 85 and 85%, respectively; those of the probiotics group were 85, 80, and 80%, respectively; and those of the synbiotics group were 80, 80, and 85%, respectively.

본 연구는 기존의 probiotics로서의 안전성을 입증한 B. cabrialesii sp. K1과 prebiotics 중 inulin 3%와 혼합하여 synbiotics로서의 넙치의 성장과 비특이적 면역 반응 및 세균성 감염에 따른 폐사에 미치는 영향을 검토하였다. 8주 동안 단일 프로바이오틱스 B. cabrialesii sp. K1과 inulin 3% 를 혼합한 신바이오틱스를 급이 한 결과 성장에서는 유의적인 차이를 보이지 않았다. 혈액학적 검사의 경우 AST, total protein 및 cholesterol에서 유의적인 차이를 보였고 ALT와 glucose는 유의적인 차이가 없었다. 비특이적 면역반응에서는 유산균 첨가 또는 주사제로 인한 라이소자임 활성이 유익 하다고 알려져 있으나 본 연구에서는 8주동안 대조구와 비교시 유의적 차이가 없었다. 또한 B. cabrialesii K1의 경우 단일 프로바이오틱스구보다 신바이오틱스구가 대조구에 비해 NBT 활성이 증가된 것을 확인할 수 있었다. 다음 넙치의 사이토카인 발현을 확인한 결과 B. cabrialesii sp. K1를 단일 (probiotics구)로 사용했을 경우 대조구와 비교 시 비장에서 유의적으로 낮게 발현되었으나 synbiotics구의 경우 비장에서 발현이 유의하게 증가되었다. 그러나 나머지 간과 장, 신장에서는 세 개의 그룹 간의 유의적 차이를 나타내지 않았다. 마지막으로 2주동안의 인위 감염을 검토한 결과 대조구는 E. tarda 95%, S. parauberis 85%, S. iniae 85%로 각 각의 폐사율을 나타냈다. Probiotics구는 E. tarda 85%, S. parauberis 80%, S. iniae 80%의 폐사율을 보였고, synbiotics 구는 E. tarda 80%, S. parauberis 80%, S. iniae 85%로 각 각 나타났다.

Keywords

Acknowledgement

This work was supported by the research grant of Jeju National University in 2022.

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