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조피볼락(Sebastes schlegeli) 치어의 배합사료 적정 공급률과공급횟수
이진혁 ( Jin Hyeok Lee ),김강웅 ( Kang Woong Kim ),이봉주 ( Bong Joo Lee ),박건현 ( Gun Hyun Park ),이준호 ( Jun Ho Lee ),윤현호 ( Hyeon Ho Yun ),배승철 ( Sung Chul Bai ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.6
Two feeding trials were conducted to investigate the effects of feeding rate and frequency on growth performance and body composition of juvenile Korean rockfish Sebastes schlegeli reared at 15.0±0.3°C. In the first trial, three replicate fish groups averaging 2.07±0.03 g were fed a commercial diet with one of seven different daily feeding rates: 1.00%, 2.00%, 2.50%, 2.75%, 3.00%,3.25%, and satiation (3.34%) based on body weight (BW). After four weeks of feeding, fish fed the 3% diet showed significantly higher weight gain (WG) and feed efficiency (FE) than fish that received the other feeding rates. In the second trial, the optimum feeding frequency was evaluated with three replicate fish groups averaging 2.04±0.03 g. Fish were fed a commercial diet at 2.87%BW with six different daily feeding frequencies: 2, 3, 4, 5, 7, or 9 meals. After four weeks of feeding, WG, specific growth rate, FE,and protein efficiency rate in fish fed 3 meals d-1 were significantly higher than those of fish fed 7 or 9 meals d-1. In both feeding trials,proximate composition of the entire body changed depending on the feeding rate or frequency. A broken-line regression analysis based on weight gain suggested that the optimum daily feeding rate and frequency for juvenile Korean rockfish at 15°C was 2.9%BW d-1 and 2?3 meals d-1, respectively.
수온별 조피볼락(Sebastes schlegeli) 치어의배합사료 적정 공급횟수
이진혁 ( Jin Hyeok Lee ),이봉주 ( Bong Joo Lee ),김강웅 ( Kang Woong Kim ),한현섭 ( Hyon Sob Han ),박건현 ( Gun Hyun Park ),이준호 ( Jun Ho Lee ),윤현호 ( Hyeon Ho Yun ),배승철 ( Sung Chul Bai ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.6
We conducted two feeding trials to investigate the optimal feeding frequency of juvenile Korean rockfish Sebastes schlegeli fed a commercial diet of expanded pellets containing 47.2% crude protein, 9.2% crude lipid, and 14.5% ash at two different water temperatures. In the first experiment, triplicate groups of 20 fish with an average weight of 2 g were fed an equal amount of diet (5.97%based on body weight) at one of six feeding frequencies (2, 3, 4, 5, 7, or 9 meals/day) for four weeks at 17.5˚C. After four weeks,we measured weight gain (WG), specific growth rate (SGR), feeding efficiency (FE), and protein efficiency ratio (PER). Fish fed diet five meals/day grew significantly better than those fed nine meals/day. The second experiment used identical experimental conditions and feeding regions, except the food ration was slightly less (5.92% based on body weight) and the water temperature was increased to 20˚C. After four weeks, we again measured WG, SGR, FE and PER. Fish fed seven meals/day grew significantly faster than those fed 2, 3, 4, or 9 meals/day. Whole-body protein levels in fish fed three meals/day was higher than those fed four meals/day in 17.5˚C water, but whole-body lipids in the fish fed four meals/day was higher than those fed two meals/day in 20˚C water. A second-order polynomial analysis based on WG suggested the optimal feeding frequency for juvenile Korean rockfish was five meals/day at 17.5˚C and six meals/day at 20˚C, indicating that fish reared in higher water temperature require higher feeding frequencies.
Renal Failure in a Female Muskrat
H M Arif Ullah(울라아리프),A. K. Elfadl(아메드 엘파들),SunYoung Park(박선영),Myung-Jin Chung(정명진),Ji-Yoon Son(손지윤),Hyun-Ho Yun(윤현호),Jae-Min Park(박재민),Jae-Hyuk Yim(임재혁),Seung-Jun Jung(정승준),Jin-Kyu Park(박진규),Kyu-Shik 한국생명과학회 2020 생명과학회지 Vol.30 No.7
야생 포유류의 신부전 증후군은 거의 보고가 없다. Muskrat (Ondatra zibethicus)는 중간 크기의 설치류이며 많은 질병을 가지고 있으나, 신부전 증후군은 보고된 바가 없으며, 본 케이스는 병리학적 진단을 위해 6개월령 암컷사향쥐의 다른 임상증후군 없는 상태로 부검을 실시하였다. 요관, 신장결석과 수진증을 관찰하였고, 결석에 의한 심각한 신장 손상과, 뇌 손상을 포함한 전신 출혈과 석회화가 관찰되었고, 이는 신장 손상으로 인한 요로결석과 장기 손상에 기인한 것이다. 괴사 및 미세석회화는 신장 피질 및 수질에서, 특히 근위 곡 세뇨관 및 신장의 수집관에서 검출되었다. 사구체의 초자양변성이 크게 관찰되었으며 이는 만성 신염을 나타내며. 이러한 소견은 특히 신장에 대한 진균성 독성 효과를 나타내는 것으로 사료된다. 또한, 폐에서 호중구 및 단핵 세포의 침윤이 관찰되었고, 비장에서도 만성 염증세포인 형질세포의 침윤이 관찰되었다. 본 소견에서는 사향쥐 신부전에 따른 사인은 오염된 사료섭취로 의심되는 것으로 판단된다. Renal failure syndrome in wild mammals is infrequently reported. Muskrat (Ondatra zibethicus) is a medium-sized rodent known to carry many diseases but rarely exhibiting renal failure. A six-month old female muskrat was submitted to our laboratory for pathological diagnosis, and necropsy revealed severe renal damage with sand-like lithiasis in the ureter, renal calculi, and hydronephrosis. All major organs, including the cerebrum, also showed systemic hemorrhage and calcification which may have been due to uremia induced by renal failure. Histopathologically, necrosis and microcalcification were detected in the renal cortex and the medulla, especially in the proximal convoluted tubules and collecting ducts of the kidney. Significant hyalinization of the glomeruli was also observed, and this suggested chronic nephritis. These findings would support mycotoxic effects, particularly on the kidney. Moreover, infiltration of neutrophils and mononuclear cells was observed in the lung and of plasma cells in the spleen. The definitive cause of the toxic effects in this case of muskrat renal failure could be attributed to contaminated food.