β-1,3/1,6-linked glucan 첨가사료가 넙치의 비특이적면역반응에 미치는 영향
The effects of β-1,3/1,6-linked glucan in the diet on immune responses of olive flounder, Paralichthys olivaceus by oral admimistration
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초록
glucan 첨가 사료 투여가 넙치에 미치는 영향을 조사하기 위하여, 넙치에 glucan 0 %, 0.01 %, 0.1 %, 0.5 % 첨가 사료를 연속 투여구와 격주 투여구로 나누어 공급하면서, 성장, 혈액 성분, 비특이적 면역능을 분석하였으며, 나아가 어병 세균인 Edwardsiella tarda 균의 공격 실험에 대한 방어능을 조사하였다. glucan 첨가 사료 투여는 넙치의 성장에 긍정적인 효과를 보였는데, 특히 0.05 % 연속 투여구와 0.1 % 격주 투여구에서 대조구보다 유의하게 높은 성장을 나타내었다. glucan 첨가사료의 투여가 넙치의 비특이적 면역 반응에 미치는 영향을 조사하기 위해, 혈청 lysozyme과 전신 식세포의 활성 산소를 측정한 결과, 거의 모든 실험구에서 실험 기간 내내 대조구보다 높은 활성을 보였다. glucan 첨가 사료의 투여가 넙치의 생리에 영향을 미치는 지를 조사하기 위하여, Total protein, glucose, GOT, GPT, Ht를 측정한 결과, 3주째 GPT 수치가 다소 높은 것을 제외하고는 그다지 큰 변화를 보이지 않았다. 마지막으로 Edwardsiella tarda (4×106 cells/fish) 균을 공격 실험한 결과, 0.01 % 연속 투여구를 제외한 모든 실험구에서 높은 방어력을 보였다.
Abstract
The effects of dietary β-1,3/1,6-linked glucan administration on nonspecific immune responses, hematology and disease resistance against Edwardsiella tarda in olive flounder, Paralichthys olivaceus were evaluated. Fish were fed the experimental diets supplemented with 0 %, 0.01 %, 0.05 %, 0.1 %, and 0.5 % of β-glucan to a commercial diet for 7 weeks. The test was performed in two ways such as fed on each β-glucan concentrations daily and every other week alternately. The body weight gain from the fish fed on daily the 0.05 % supplemented diet and fed on alternately the 0.1 % supplemented diet of β-glucan were significantly higher than the control. Both lysozyme activity and intracellular superoxide anion production of kidney phagocytes were higher in the all experimental groups than in the control. But there was no large difference in hematology among each group. The relative percent survival rate (RPS) after an artificial challenge with 4×106 cells of E. tarda per fish was higher than the control, except for that fed on daily the 0.01 % supplemented diet.
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