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DOI QR Code

ADDITIVE NATURE OF DIGESTIBLE ENERGY AND RELATIVE ENERGY VALUES OF DIFFERENT ENERGY-YIELDING NUTRIENTS IN PRACTICAL TROUT DIETS

  • Kim, J.D. (Korea Special Feed Mill Co., Ltd.) ;
  • Kaushik, S.J. (Laboratoire de Nutrition des poissons, INRA)
  • Received : 1990.02.14
  • Accepted : 1990.05.30
  • Published : 1990.09.01

Abstract

A study is reported which investigated the additive nature of digestible energy (DE) from dietary nutrients and to estimate the relative energy values of different energy-yielding nutrients in practical trout diets. A growth study was conducted over 12 weeks with 6 diets. Rainbow trout (Oncorhynchus mykiss) were fed diets once a day ad libitum. Digestible energy values determined and calculated had direct relationship indicating additive nature of such values for feed ingredients. Overall growth performance was best in a diet containing 33% digestible protein (DP) with a DP/DE ratio of 18.6. A reduction in digestible protein level with the same DP/DE rat io led to a significant decrease in growth and feed efficiency. The increase of 7% of lipid with concomitant decrease in protein resulted in the relative gain of 130% in growth and nutrient retention, suggesting that 1 g of lipid is equal to about 1.3 g of proteins in terms of net energetic value. Replacement of 10% of dietary lipid by carbohydrates led to a slight decrease in energy retention efficiency but to a great increase in lipid retention efficiency (130%) showing that dietary carbohydrates led to increased lipogenesis.

Keywords

Digestible Energy;Relative Energy Value;Rainbow Trout;DP/DE Ratio

Acknowledgement

Supported by : INRA