Digestible and Metabolizable Energy of Various Diets for Carp and Rainbow Trout

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  • Digestible and Metabolizable Energy of

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Abstract

This study was conducted to determine digestible and metabolizable energy values(DE and ME) of eight practical diets and five commercial diets for carp. The proportion of DE to gross energy (GE) of the practical diets determined with large carp (150_??_300g) was 76.3_??_81.6%. The proportion of nonfecal energy losses to GE varied from 2.2 to 3.0%, leading to ME values ranging from 3.17 to 3.54 kcal/g. The ME/DE rates were 96.1_??_97.2% (96.7% on average).<br> In the next experiment, amino acid imbalanced diets were used to examine the effect of feeding levels on non-fecal energy losses in rainbow trout. In the fish fed diets having a low EAA index (68.8), the proportion of non-fecal energy loss to GE increased with decrease of the GE intake, suggesting a low ME value. It is inferred that not only amino acid absorbed but also tissue proteins are deaminated to yield energy.<br> Seven diets, in which the EAA index ranged from 83.8 to 89.7, were fed to carp and rainbow trout to determine the energy values of the diets. In both species the effect of the EAA index on the non-fecal energy loss was not great and the ME/DE rates were 98.5% in carp and 97.6% in rainbow trout on average.

Journal

  • Fisheries science

    Fisheries science 61 (2), 215-222, 1995

    The Japanese Society of Fisheries Science

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