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Effect of feeding time on digestibility, growth performance and protein metabolism in the rainbow trout Oncorhynchus mykiss : interactions with dietary fat levels

Published online by Cambridge University Press:  15 March 2000

Valérie Bolliet
Affiliation:
Équipe nutrition, aquaculture et environnement, unité mixte Inra/Ifremer de nutrition des poissons, station d’hydrobiologie Inra, BP 3, 64310 Saint-Pée-sur-Nivelle, France
Chonlatee Cheewasedtham
Affiliation:
Department of Zoology, University of Aberdeen, Tyllidrone avenue, AB9 2TN Aberdeen, Scotland, UK
Dominic Houlihan
Affiliation:
Department of Zoology, University of Aberdeen, Tyllidrone avenue, AB9 2TN Aberdeen, Scotland, UK
Anne Gélineau
Affiliation:
Équipe nutrition, aquaculture et environnement, unité mixte Inra/Ifremer de nutrition des poissons, station d’hydrobiologie Inra, BP 3, 64310 Saint-Pée-sur-Nivelle, France
Thierry Boujard
Affiliation:
Équipe nutrition, aquaculture et environnement, unité mixte Inra/Ifremer de nutrition des poissons, station d’hydrobiologie Inra, BP 3, 64310 Saint-Pée-sur-Nivelle, France
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Abstract

The effect of feeding time was studied in rainbow trout fed different dietary levels of fat. Fish were fed either 1 h after light on in the morning or 1 h after light off in the evening with a low energy diet (LE, 6 % lipid) or a high energy diet (HE, 23 % lipid). Regardless of the diet, apparent digestibility and post-prandial protein synthesis were higher in fish fed in the morning than in those fed at the beginning of the night. In fish fed the LE diet in the morning, growth performance and nutrient retention efficiency tended to be higher than in those fed at the beginning of the night. In contrast, fish fed the HE diet in the morning had lower protein growth rate, protein content and protein retention efficiency than those fed in the evening. These results suggest that protein metabolism might be involved in the effect of feeding time on growth and that there is an interaction between the time of feeding and dietary level of fat on growth.

Type
Research Article
Copyright
© Elsevier, Inra, Ifremer, Cemagref, Ird, Cnrs, 2000

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