Influence de la fréquence de distribution des protéines sur la croissance et l'efficacité alimentaire chez la truite arc-en-ciel (Salmo gairdneri R.)

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Abstract
Twelve groups of 100 rainbow trout were fed fixed levels of protein provided by a commercial diet offered in 2, 3 or 4 meals/day. Energy was given either at a fixed level (2R, 3R, 4R) or ad lib by supplementation with a non-protein diet (2R + EO, 3R + EO, 4R + EO). Growth, protein and energy intake as well as efficiencies of protein and energy utilization were studied. Growth and feed efficiency ratio groups 2R, 3R and 4R were not significantly different. Groups 2R + EO, 3R + EO and 4R + EO supplied with supplementary energy showed the same growth rates as groups 2R, 3R and 4R, so that their feed efficiency ratios were higher than in the other groups. No significant changes were observed in protein and energy composition in trout of the different groups. Under experimental conditions, there was no substantial advantage of subdividing the daily protein supply irrespective of the manner in which dietary energy was delivered. It appeared that the number of protein meals was too small to bring any significant changes in efficiency of protein deposition. These points are discussed in the light of digestive and metabolic characteristics of fish.

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