치어기 넙치 (Paralichthys olivaceus)의 사료내 복합 유기산제 및 Essential Oil 첨가에 따른 성장효과 및 항생제 대체 효과

Abstract

The present study was conducted to determine Effect of dietary organic acid products and Essential Oil products in growth performance and antibiotics replacement in olive flounder paralichthys olivaveraging. Fish averaging 3.5 ± 0.05 g(mean ± SD) were fed one of the ten semi-purifide diets : Diet 1 ; Control (Con), Diet 2 ; add antibiotics - 50mg OTC / kg body weight / day(Antibio), Diet 3 ; Add organic acid blend A - 4g/kg diet(OABA), Diet 4 ; add organic acid blend B - 4g/kg diet(OABB), Diet 5 ; add Essential oil blend - 0.25g/kg diet(EO0.25), Diet 6 ; add Essential oil blend - 0.5g/kg diet(EO0.5) for 10 weeks. There was no significant differences in weight gain(WG), feed efficiency(FE), specific growth rate(SGR) and protein efficiency ratio(PER) among fish fed all diet. Total bacterial count in intestine showed that fish fed OABA diet, OABB diet, EO0.25 diet, EO0.5diet and Antibio diet has a significantly lower than fish fed Control diet(P〈0.05). Fish fed organic acid, EO or OTC supplemented diets in this experiment tended to decrease count of Vibrio spp. compared with fish fed control diet without any added additives but these differences were not significantly different. Challenge test showed that fish fed Antibio diet, OABA diet, OABB diet, EO0.25diet and EO0.5diet has a significantly lower cumulative mortality rate than fish fed Control diet. There were no significant differences In GOT, GPT, cholesterol and glucose among fish fed the various diets. In conclusion, the results of the present study indicated that dietary organic acids or essential oil has the potential to be used as an effective health management practice for preventing diseases caused by Edwardsiella tarda in olive flounder. But bio-availability between OABA diet and OABB has not different.