Nutritional and economic values of by-products used in poultry diets in Benin: the case of soybean, cotton and palm kernel meals

摘要

nbsp;Theaimofthisstudywastocomparetheeffectsoftwosoybeanmeals(S1,S2)andtwopalmmeals(P1,P2)fromsolventandexpellerprocessing,andtwocottonmeals(C1,C2)bothfromsolventprocessingonthebio-economicperformancesofbroilers.360broilersRedBrowerefedsixdietscontainingthesemeals.Atstarterphase(d1to21ofage)onlythedietsS1(solvent)andS2(expeller)wereused,whileatgrowerphase(d22to49ofage)thesixdietsweretested.Then,abalanceexperimentwascarriedouttoevaluatethemetabolismofnitrogenandenergy.nbsp;Resultsshowedsimilarfeedintakeinalldietsateachphase.ThebodyweightwassignificantlylowerinS2atd21(419ginS1vs320ginS2)andatd49(1531ginS1vs1374ginS2).Atd49,thehighestaveragebodyweight(1543ginC1)wassignificantlydifferentfromthelowestweight(1374ginS2).However,thedailybodyweightgains(WG)werenotaffectedbydiets.Themortalityrateswerenullatgrowerphaseandsimilaratstarterphase(2.4%inS1vs2.1%inS2).ThefeedconversionratiowassignificantlylowerinS1thanS2atstarterphase(1.9vs2.5),andsimilarlater.Theprocessingofsoybeansignificantlyaffectedthefeedcost(FC)andtheeconomicfeedefficiency(EFE)duringthestarterphase.FCwas0.563vs0.729#8364;/kgWG,andEFEwas2.9vs2.2#8364;WG/#8364;feed,respectivelyinS1andS2.Atgrowerphase,thelowestFC(0.633#8364;/kgWGinC1)wassignificantlydifferentfromthehighest(0.773#8364;/kgWGinS2).Onthecontrary,nosignificanteffectoftheprocessingtechnologywasnoticedontheFCandtheEFEwithpalmmealsandcottonmealsdiets.Themetabolizabilityofenergywasaffectedbythediet,whileitwasthecontraryfornitrogen.Computedperkgofmetabolicbodysize(kg0.75),thedailyintakeofnitrogenwassignificantlyaffectedbytheprocessingtechnologyofallthreetypesofmeals.Onthecontrary,onlytheprocessingtechnologyofcottonmealshadsignificanteffectontheintakeofME.nbsp;ItcanbeconcludedthatinBenintheprocessingofsoybeanmealhadsignificanteffectsonbio-economicperformancesofbroilersatstarterphase,andontheirbodyweightatgrowerphase.