Journal of Aquaculture (한국양식학회지)

The Korean Society of Fisheries and Aquatic Science (한국양식학회)
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Optimum Dietary Protein and Lipid Levels on Growth in Parrot Fish (Oplegnathus fasciatus)

돌둠사료의 적정 단백질 및 지질 함량

  • Published : 1998.02.01
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Abstract

A feeding trial was conducted to investigate optimum dietary protein and lipid levels in diets for parrot fish (Oplegnathus fasciatus). Three groups of 25 fish averaging 7.0g were fed each of the experimental diets containing 30, 40, 50 or 60% crude protein (CP) with 8 or 16% crude lipid level ($4{\times}2$factorial desing) for 8 weeks. Weight gain and feed efficiency increased significantly (P<0.05) with dietary protein level up to 50% CP when diets contained 16% lipid level, and increased with dietary protein level up 60% CP when diets contained 8% lipid level (P<0.05). The broken-like model showed that an optimum dietary protein level was 46% when the diet contained 16% dietary lipid. Fish fed diets containing 16% lipid level showed significantly (P<0.05) higher weight gain, feed efficiency and protein efficiency ratio than did fish fed diets containing 8% lipid level when diets contained 40 or 50% dietary protein (P<0.05).

돌돔 사료의 적정 단백질 및 지질 함량을 구하기 위해 북양어분과 카제인을 단백원으로 하여 사료의 단백질 함량이 30, 40, 50 및 60%가 되도록 하고, 각 단백질 함량에 지질 함량이 8 및 16%가 되는 8종의 실험사료로 평균체중 7 g의 돌돔을 대상으로 8주간 사육 실험하였다. 사료의 단백질 함량에 따른 증체율 및 사료효율은 사료지질 8% 수준에서 사료단백질이 40% 이상인 사료구에서는 사료단백질 함량이 증가함에 따라 유의차 있게 증가하였으며(P<0.05), 사료지질 16% 수준에서는 사료단백질이 증가함에 따라 증가하다가, 사료단백질 50% 이상에서는 유의적인 차이가 없었다(P>0.05). 사료지질 16% 수준에서 broken line model을 이용하여 증체율을 지표로 하여 돌돔의 적정 단백질 요구량을 구한 결과 46%로 추정되었다. 사료의 지질 함량에 따른 증체율은 사료단백질 40 및 50% 수준에서 고지질 사료구(16%)가 유의하게 높았으며, 사료효율은 모든 사료단백질 수준에서 고지질 사료구(16%)가 유의하게 높았다(P<0.05). 단백질 효율 및 단백질 축적율은 모든 사료단백질 수준에서 고지질 사료구가 높았다. 따라서 성장과 사료효율을 기준으로 볼 때 돌돔 사료의 적정 지질 함량은 16% 전후로 추정되었다. 전어체 및 등근육의 성분에서 단백질은 사료의 단백질 함량이 증가함에 따라 증가하다가 사료 단백질 40% 이상에서는 유의차가 없었으며, 지질은 모든 사료단백질 수준에서 고지질 사료구가 높았다. 간 및 내장의 성분에서 단백질은 사료의 단백질 함량에 따라 뚜렷한 경향이 없었지만, 지질은 모든 사료단백질 수준에서 고지질 사료구(16%)가 높았다.

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