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넙치(Paralichthys olivaceus) 사료 내 phytosterol의 이용 가능성 평가
신재형,이초롱,김유정,신재범,임현운,윤관식,이경준 제주대학교 해양과학연구소 2020 해양과환경연구소 연구논문집 Vol.44 No.-
We evaluated the effects of dietary supplementation of phytosterol on the growth, feed utilization, immunity, digestibility, wound healing ability and disease resistance of olive flounder Paralichthys olivaceus. We conducted two consecutive feeding trials at different growth stages of the fish: EXP-1 (68.9 g) and EXP-2 (16.5 g). The experimental diets were supplemented with graded levels of phytosterol (1% ecdysteroid extracted from Achyranthis radix) at 0, 0.025, 0.05, 0.1, 0.2 and 0.4% (designated as Con, PHY0.025, PHY0.05, PHY0.1, PHY0.2 and PHY0.4, respectively). Dietary phytosterol did not significantly affect growth and cholesterol concentration. Feed utilization was higher in fish fed phytosterol-supplemented diets than in fish fed the control diet. Dietary phytosterol increased innate immunity and digestibility of protein and dry matter. Wound healing ability was also increased by the phytosterol supplementation. The survival against Edwardsiella tarda challenge was higher in fish fed low-phytosterol diets than in fish fed the control diet. The optimum dietary level of phytosterol seems to be approximately 0.05%. The results in this study indicate that the phytosterol could be used as a functional supplement in diets to improve feed utilization, immunity, digestibility and wound healing ability of olive flounder.
효소처리어분에 대한 치어기 대서양 참다랑어(Thunnus thynnus)의 in vivo 및 in vitro 소화율 평가
신재형,지승철,이경준 제주대학교 해양과학연구소 2020 해양과환경연구소 연구논문집 Vol.44 No.-
This study was conducted to investigate in vivo and in vitro digestibility in juvenile Atlantic Bluefin tuna Thunnus thynnus. In vivo digestibility was compared between four experimental diets to determine the optimum dietary inclusion level of an enzyme-treated sardine fish meal (EFM) and sardine fish meal (FM). The experimental diets were as follows; EFM75 (75% EFM), EFM60 (60% EFM and 15% FM), FM75 (75% FM) and SL (frozen sand lance) as a raw fish feed. Feces of Bluefin tuna (90.3 g) were collected both by siphoning from a 700 L cage and by dissection in 69 ton concrete rearing tanks. For the siphoning method, protein digestibility was higher in the tuna fed SL diet than that of other groups. The lowest protein digestibility was observed in FM75. For the dissection method, protein digestibility was higher in tuna fed EFM75 diet than that of other groups. The lowest protein digestibility was observed in the EFM60 group. In vitro digestibility was compared in six protein sources to find an alternative source of EFM for the tuna feed. The highest in vitro digestibility was observed in EFM (92%) followed by low temperature FM (72%), meat meal (65%), feather meal (60%), sardine fish meal (57%) and poultry by-product meal (55%).
효소처리어분에 대한 치어기 대서양 참다랑어(Thunnus thynnus)의 in vivo 및 in vitro 소화율 평가
신재형,지승철,이경준 한국수산과학회 2020 한국수산과학회지 Vol.53 No.3
This study was conducted to investigate in vivo and in vitro digestibility in juvenile Atlantic Bluefin tuna Thunnusthynnus. In vivo digestibility was compared between four experimental diets to determine the optimum dietary inclusionlevel of an enzyme-treated sardine fish meal (EFM) and sardine fish meal (FM). The experimental diets were asfollows; EFM75 (75% EFM), EFM60 (60% EFM and 15% FM), FM75 (75% FM) and SL (frozen sand lance) as araw fish feed. Feces of Bluefin tuna (90.3 g) were collected both by siphoning from a 700 L cage and by dissection in69 ton concrete rearing tanks. For the siphoning method, protein digestibility was higher in the tuna fed SL diet thanthat of other groups. The lowest protein digestibility was observed in FM75. For the dissection method, protein digestibilitywas higher in tuna fed EFM75 diet than that of other groups. The lowest protein digestibility was observedin the EFM60 group. In vitro digestibility was compared in six protein sources to find an alternative source of EFMfor the tuna feed. The highest in vitro digestibility was observed in EFM (92%) followed by low temperature FM(72%), meat meal (65%), feather meal (60%), sardine fish meal (57%) and poultry by-product meal (55%).
넙치(Paralichthys olivaceus) 사료 내 phytosterol의 이용 가능성 평가
신재형,이초롱,김유정,신재범,임현운,윤관식,이경준 한국수산과학회 2020 한국수산과학회지 Vol.53 No.2
We evaluated the effects of dietary supplementation of phytosterol on the growth, feed utilization, immunity, digestibility,wound healing ability and disease resistance of olive flounder Paralichthys olivaceus. We conducted two consecutivefeeding trials at different growth stages of the fish: EXP-1 (68.9 g) and EXP-2 (16.5 g). The experimentaldiets were supplemented with graded levels of phytosterol (1% ecdysteroid extracted from Achyranthis radix) at 0,0.025, 0.05, 0.1, 0.2 and 0.4% (designated as Con, PHY0.025, PHY0.05, PHY0.1, PHY0.2 and PHY0.4, respectively). Dietary phytosterol did not significantly affect growth and cholesterol concentration. Feed utilization washigher in fish fed phytosterol-supplemented diets than in fish fed the control diet. Dietary phytosterol increased innateimmunity and digestibility of protein and dry matter. Wound healing ability was also increased by the phytosterolsupplementation. The survival against Edwardsiella tarda challenge was higher in fish fed low-phytosterol diets thanin fish fed the control diet. The optimum dietary level of phytosterol seems to be approximately 0.05%. The results inthis study indicate that the phytosterol could be used as a functional supplement in diets to improve feed utilization,immunity, digestibility and wound healing ability of olive flounder.
신재형,신재범,엄건호,이경준 제주대학교 해양과학연구소 2021 해양과환경연구소 연구논문집 Vol.45 No.-
This study was conducted to determine the supplemental effects of two insect meals, mealworm (MW) and black soldier fly (BSF), with high or low lipid levels in diets, on Pacific white shrimp Litopenaeus vannamei. Sardine and tuna by-product meals were used as the fish meal source in a control (Con) diet. The fish meals were replaced with MW, defatted MW (deMW), BSF or defatted BSF (deBSF), respectively. The shrimp (body weight: 0.47 g) were stocked into 20 acryl tanks (215 L) and fed the diets six times a day. After 45 days of the feeding trial, the shrimp that were fed insect meals had significantly higher phenoloxidase and superoxide dismutase activities than the shrimp fed Con diet. The gene expressions of prophenoloxidase, crustin and penaeidine-3c in shrimp hepatopancrease were also higher in shrimp that were fed the insect diets, regardless of defatting than those in shirmp that were fed Con diet. The survival against Vibrio parahaemolyticus was higher in shrimp that were fed the diets containing defatted insect meals than in shrimp that were fed Con diet. These results indicate that MW and BSF, regardless of lipid levels, could be good protein sources for the enhancement of innate immunity and anti-oxidant capacity of the shrimp.
조피볼락(Sebastes schlegelii) 사료 내 합성 비타민C 대체원으로써의 감귤부산물과 발효 감귤부산물의 첨가 효과
신재형,송진우,김민기,임현운,임종호,이경준 제주대학교 해양과학연구소 2021 해양과환경연구소 연구논문집 Vol.45 No.-
The study was conducted to investigate the dietary supplementation of citrus by-product (CBP) and CBP fermented with Bacillus subtilis (BS) or B. pumilus (BP) on growth performance, feed utilization, innate immune responses and disease resistance of Korean rockfish Sebastes schlegelii. Triplicate groups of juvenile fish (initial weight of 22.9 g) were fed one of five experimental diets which were formulated to replace a synthetic vitamin C (L-ascorbyl- 2-polyphosphate, LAPP) with CBP or fermented CBP. A basal diet without LAPP and CBP was used as the control diet (Con). At the end of the 13 weeks feeding trial, growth performance, feed utilization and survival of fish fed the Con were significantly lower than those of fish fed the LAPP, CBP and fermented CBP diets. Fish fed the Con were significantly lower in lysozyme activity than fish fed LAPP, CBP and fermented CBP diets. In a challenge test against Edwardsiella tarda, cumulative mortality of fish fed LAPP, CBP and fermented CBP diets was significantly lower (20-30%) than that of the Con (60%). The findings in this study indicate that the CBP and/or fermented CBP can be a promising vitamin C source for LAPP replacement in diet for Korean rockfish.
신재형 ( Jaehyeong Shin ),신재범 ( Jaebeom Shin ),엄건호 ( Gunho Eom ),이경준 ( Kyeong-jun Lee ) 한국수산과학회 2021 한국수산과학회지 Vol.54 No.5
This study was conducted to determine the supplemental effects of two insect meals, mealworm (MW) and black soldier fly (BSF), with high or low lipid levels in diets, on Pacific white shrimp Litopenaeus vannamei. Sardine and tuna by-product meals were used as the fish meal source in a control (Con) diet. The fish meals were replaced with MW, defatted MW (deMW), BSF or defatted BSF (deBSF), respectively. The shrimp (body weight: 0.47 g) were stocked into 20 acryl tanks (215 L) and fed the diets six times a day. After 45 days of the feeding trial, the shrimp that were fed insect meals had significantly higher phenoloxidase and superoxide dismutase activities than the shrimp fed Con diet. The gene expressions of prophenoloxidase, crustin and penaeidine-3c in shrimp hepatopancrease were also higher in shrimp that were fed the insect diets, regardless of defatting than those in shirmp that were fed Con diet. The survival against Vibrio parahaemolyticus was higher in shrimp that were fed the diets containing defatted insect meals than in shrimp that were fed Con diet. These results indicate that MW and BSF, regardless of lipid levels, could be good protein sources for the enhancement of innate immunity and anti-oxidant capacity of the shrimp.