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Partial substitution of fish meal by sesame oil cake(Sesamum indicum) in the diet of brown trout(Salmo trutta fario) and rainbow trout(Oncorhynchus mykiss) fry:an interspecific comparison

Partial substitution of fish meal by sesame oil cake(Sesamum...

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The 14th International Symposium on Fish Nutrition & Feeding

作者： Tran Thi Nang Thu Julien Henrotte Yvan Larondelle Xavier Rollin Laboratoire de Pisciculture Huet Institut des Sciences de la VieUCLouvainroute de Blocry2B-1348 Louvain-la-NeuveBelgium Faculty of Animal Sciences and Aquaculture Hanoi University of AgricultureTrau QuyGia LamHanoiVietnam

Our objectives were to test the potential replacement of fish meal by sesame oil cake(SOC) in high energy diets fed to rainbow trout(RT,Oncorhynchus mykiss) and brown trout(BT,Salmo trutta fario).Groups of trout(initial body weight(BW) of 1.42 g for RT and 1.48 g for BT) were fed to visual satiety with isonitrogenous(61 g digestible N kg dry matter(DM)) high-energy (22.1 MJ kg DM ) freeze-dried diets,in which fish meal was progressively replaced by SOC(0, 13,26,39 and 52%,on a N basis).Apparent digestibility coefficient(ADC) of the diets was determined using the indirect method.A growth trial was conducted over feeding 45 days at 15±0.6℃.Protein digestibility was high(91%) and was unaffected by either diet or *** of energy was reduced by 5.5%in both species when SOC replaced 52%of fish meal protein and was significantly higher in BT compared to *** rate increased when SOC progressively replaced fish meal until reaching a maximum at a substitution rate of 39%for RT and 26%for BT. In both species,DM intake(%BW day) linearly increased with substitution rate and feed efficiency was adversely affected by *** and energy retention efficiencies were little affected by diet(except in the 52%SOC diet for RT which showed significantly lower protein retention efficiency),but were significantly lower in BT compared to RT,especially energy retention efficiency(42.5-44.8%in RT vs.32.7-35.8%in BT).The positive effect of SOC on growth was mainly explained by a general increase in feed intake(2.54 and 3.23%BW day in RT and 1.73 and 2.10%in BT,for the fish meal control diet and the 52%SOC diet,respectively). From our results,it is concluded that SOC can substitute at least 52%of fish meal protein both in RT and in BT fry without negative effect in growth rate.

关键词： sesame oil cake Rainbow trout Brown trout Digestibility Voluntary feed intake

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