魚体分析による体内保留Nの測定法について〔魚類の蛋白質栄養に関する研究-7-〕

概要

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In order to estimate nitrogen which was lost endogenously during an experimental period, the analyses of the carcass and the excreta for nitrogen were carried out with carp and rainbow trour after feeding them with the protein-free diet. The endogenous loss of nitrogen in carp and rainbow trout were, on the average, 14 mg and 9.5 mg/100g wt/day, respectively, and the values changed in direct proportion to the body weight, Accordingly, the nitrogen retained in the fish body can be calculated respectively by the following equations, when feeding of the fish was done in relatively short period of around 20 days; (carcass-N increase of protein fed group (g))+(w1+w2/2×0.00014(for carp) or 0.000095 (for rainbow trout)×d(g)), where w1 and w2 denote the body weight at the beginning and the end, and d the number of days of the feeding. The values for NPU of an egg-yolk protein at different dietary levels were determined with rainbow trout by the present method.
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