Evaluation of production efficiency of Nile tilapia (Oreochromis niloticus L.) fed diets containing crop residues in combination with cocoa bean shell and coconut oil cake in C?te d’Ivoire

摘要

A90-dayfeedingtrialwasconductedwithNiletilapia(Oreochromisniloticus)toassessthegrowth,bodycompositionandcost#8211;benefit.Tilapiajuvenilesweighing4.35#8211;4.38gweregrowninpondsandrearedonanindustrialcommercialdiet(asreference)andontwopracticaldiets.FormulateddietsweredesignatedasCBS(cocoabeanshell,cornbran,soybeanoilcakeandcottonseedsoilcake)andCOC(coconutoilcake,cornbran,soybeanoilcakeandcottonseedsoilcake).Threereplicatepondswererandomlyassignedtoeachofthethreedietarytreatments.Eachdietcontainedapproximately28%crudeprotein.Fishwerefedtwicedaily(9.00hand15.00h).Theusedstockingdensitywas15fish/m2.Thehighestweightgain(44.7g)andthebestfeedconversionratio(1.10)wereobtainedinfishfeddietCBS.Thepoorestweightgain(33.3g)andthefeedconversionratio(1.41)wererecordedfordietCOC.However,tilapiafeddietsCOCandcommercialfeeddisplayedsimilargrowthandfeedefficiencypatterns.FatdepositionwashigherinfishrearedondietsCBSandCOCcomparedtothereferencediet.DietsCBSandCOCreducedthecostoffeedingperunitofweightgainby35.6and17.8%,respectively.