Effects of Bisroot in the Diet on Growth, Body Composition, Immume responses of Nile Tilapia, Oreochromis niloticus

사료 중 비스루트가 나일틸라피아, Oreochromis niloticus의 성장, 체조성 및 면역 방응에 미치는 영향

  • Published : 1998.11.01

Abstract

The present study investigated the effects of Bisroot, that contains live bacteria (Bacillus polyfermenticus, Bacillus mesentericus, Streptococcus faecalis, & Bifidobacterium breve) and digestive enzymes (protease, lipase), on the growth, body composition and immune response of Nile tilapia fingerlings. One percent of the Bisroot was added to the experimenta feed. All exprimental fish were fed for 60 days. The weigh gains among the experimental fish were not significntly different (P>0.05). Hematocrit value, hemoglobin, total protein, glucose, GOT, and GPT were unaffected by Bisroot treatment. However, it was observed that glucose, GOT, and GPT value in the fish that were fed Bisroot, were lower than the control. The complement activity ($CH_50$) tended to be significantly increased by Bisroot treatment, but not lysozyme activity. Phagocytosis and respiratory burst activities of macrophages in the head kidney were enhanced by Bisroot. Therefore, the Bisroot diet enhances the cellular immune activities were enhanced by Bisroot. Therefore, the Bisroot diet enhances the cellular immune activities of non-specific immune responses. When fish were challenged with a virulent strain of Edwardsiella tarda, the Bisroot treated fish were more resistant than the control. The present results suggest that the introduction of Bisroot into the diet of Nile tilapia could increase their resistance against bacterial infection, reduce fish mortality, and offers economic benefits.

생균(Bacillus polyfermenticus, Bacillus mesentericus, Streptococcus faecalis, Bifidobacterium breve)과 소화 요소(protease, lipase)를 함유한 비스루트의 효과를 알아보기 위해 사료 내 1% 첨가하여 나일틸라피아 치어(19.0${\pm}$0.07g)에게 60일간 공급한 다음 성장률, 체조성 및 면역반응의 효과를 조사하였다. 60일간 사육한 결과 비스루트 첨가구와 대조구 사이에 유의적인 성장 차이를 보이지 않았지만(P>0.05), 보체의 용혈 능력은 비스루트 첨가구가 대조구에 비해 용혈능이 높은 것으로 조사되고 라이소자임의 용균 효과는 대조구와 비슷하였다. 식세포의 식작용 능력과 신장 마크로파지의 respiratory burst activity 는 비스루트 첨가구가 대조구에 비해 활성이 매우 높았다. 따라서 비스루트 사료 내 첨가가, 어류의 비특이적 면역 기능중에서 세포성 면역 기능을 활성화하는데 기여하였다. 병원성 세균 Edwardsiella tarda FSW 910410 균주로 공격 실험결과 비스루트 첨가구가 누적폐사율이 59%, 대조구가 80%로 조사되었고, 그 결과 비스루트 첨가구는 병원성 세균에 대한 저항력을 증가시켰다(P<0.05). Hematocrit, hemoglobin, total protein, glucose, GOT, GPT 와 같은 혈액 성분을 분석한 결과 비스루트 첨가구와 대조구 간의 유의차는 없었지만(P>0.05), glucose, GOT, GPT는 비스루트 첨가구가 대조구에 비해 낮게 나타났다. 이상의 결과로 비스루트는 나일틸라피아의 생리 기능에 문제를 야기시키지 않고, 비특이적 면역 기능 중 세포성 면역 기능을 증강시키는 효과가 있으며, 병원성 세균에 대한 저항력의 증강 효과도 높다. 따라서, 비스루트는 나일틸라피아의 사료 첨가물로서의 역할이 충분히 기대된다.

Keywords

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