Abstract
The hypothesis was tested that fish fed to satiation with iso-energetic diets differing in macronutrient composition will have different digestible energy intakes (DEI) but similar total heat production. Four iso-energetic diets (2×2 factorial design) were formulated having a contrast in i) the ratio of protein to energy (P/E): high (HP/E) vs. low (LP/E) and ii) the type of non-protein energy (NPE) source: fat vs. carbohydrate which were iso-energetically exchanged. Triplicate groups (35 fish/tank) of rainbow trout were hand-fed each diet twice daily to satiation for 6 weeks under non-limiting water oxygen conditions. Feed intake (FI), DEI (kJ kg-0.8 d-1) and growth (g kg-0.8 d-1) of trout were affected by the interaction between P/E ratio and NPE source of the diet (P0.05). Our data suggest that the control of DEI in trout might be a function of heat production, which in turn might reflect a physiological limit related with oxidative metabolism.
Original language | English |
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Article number | e34743 |
Journal | PLoS ONE |
Volume | 7 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2012 |
Keywords
- european sea-bass
- voluntary feed-intake
- salmon salmo-salar
- oncorhynchus-mykiss
- food-intake
- digestible energy
- growing-pigs
- utilization efficiency
- oreochromis-niloticus
- dicentrarchus-labrax