Effect of replacing whole boiled soya beans with azolla in the diets of growing ducks

摘要

TwofeedingtrialswerecarriedouttodeterminetheeffectoffeedingAzollamicrophyllaaspartialreplacementoftheproteininboiledsoyabeanindietsbasedonsugarcanejuiceformeatducks.Theexperimentaldesignforthetrialsinvolvedfivetreatments,fourreplications(pens)and10birdsperpen.Diets,containingfivelevelsofcrudeprotein,whichwereformulatedfromboiledsoyabeansandAzollamicrophyllaandwithsugarcanejuiceadlibitumastheenergysource,werefedto200growingducks(CherryValleyhybrids).Therationswerefedfromonemonthofageuntilthebirdsreached60to70daysofage,whentwoducks(onemaleandonefemale)perpenwereslaughteredforcarcassevaluation.Inthefirsttrial,actualintakesofAzollawerelowerthanexpected,andsupplied15.2,17.9,24.4,and30.3%ofthetotalproteinindietsAz15,Az30,Az45,andAz60,respectively.Dailygains(g)were28.6,30.4,28.3,24.1,and21.4forthecontrol,Az15,Az30,Az45,andAz60diets,respectivelyanddecreasedwithlevelofazollawhenthisexceeded15%ofthedietaryprotein(P0.001).FeedconversionratiosdeterioratedwithincreasingconsumptionofAzolla(P0.001).Inthesecondtrial,actualintakesofAzollawerealsolowerthanexpected,andsupplied14.7,17.5,19.2,and22.6%ofthetotalproteinindietsAz15,Az25,Az35,andAz45,respectively.Gains(g/day)were32.6,31.5,30.2,28.2,and24.1forthecontrol,Az15,Az25,Az35,andAz45diets,withdecreaseingainwithazollalevelbeyond15%oftheprotein(P0.001).FeedconversionratiosincreasedwithincreasingconsumptionofAzolla(P0.001).Allthecarcasstraitsweresimilarforalltreatmentsinbothtrials.