Voluntary Feed Intake in Rainbow Trout Is Regulated by Diet-Induced Differences in Oxygen Use

S. Subramanian, I. Geurden, A.C. Figueiredo-Silva, S.J. Kaushik, J.A.J. Verreth, J.W. Schrama

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9 Citations (Scopus)

Abstract

This study investigated the hypothesis that the voluntary feed intake in fish is regulated by diet-induced differences in oxygen use. Four diets were prepared with a similar digestible protein:digestible energy ratio (18 mg/kJ), but which differed in the composition of nonprotein energy source. This replacement of fat (F) by starch (S) was intended to create a diet-induced difference in oxygen use (per unit of feed): diets F30-S70, F50-S50, F65-S35, and F80-S20 with digestible fat providing 28, 49, 65, and 81% of the nonprotein digestible energy (NPDE), respectively. Each diet was fed to satiation to triplicate groups of 20 rainbow trout for 6 wk. As expected, diet-induced oxygen use decreased linearly (R(2) = 0.89; P <0.001) with increasing NPDE as fat. The digestible and metabolizable energy intakes of trout slightly increased with increasing NPDE as fat (i.e., decreasing starch content) (R(2) = 0.30, P = 0.08; and R(2) = 0.34, P = 0.05, respectively). Oxygen consumption of trout fed to satiation declined with increasing dietary NPDE as fat (R(2) = 0.48; P = 0.01). The inverse relation between digestible energy intake of trout and the diet-induced oxygen use (R(2) = 0.33; P = 0.05) suggests a possible role of diet-induced oxygen use in feed intake regulation as shown by the replacement of dietary fat by starch.
Original languageEnglish
Pages (from-to)781-787
JournalThe Journal of Nutrition
Volume143
Issue number6
DOIs
Publication statusPublished - 2013

Keywords

  • tilapia oreochromis-niloticus
  • oncorhynchus-mykiss
  • food-intake
  • digestible energy
  • nile tilapia
  • induced thermogenesis
  • lipid level
  • dicentrarchus-labrax
  • growth-performance
  • self-feeders

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