Use of duckweed (Lemna spp) as replacement for soya bean meal in a basal diet of broken rice for fattening ducks

摘要

AnexperimentwasconductedatCanthoUniversitytodeterminetheeffectsoffeedingduckweed(Lemnasp.)replacingtheroastedsoyabeansindietsbasedonbrokenriceforcrossbredmeatducks.Thetrialincludedfivetreatments,withfourreplicatesand10ducksperreplicate(pen).Thefivedietswerebasedonbrokenriceadlibitumsupplementedwith27g/dayroastedsoyabeans(controlD0)or19,15,12orzerog/daysoyabeanswithadlibitumfreshduckweed(D30,D45,D60andD100).Thesedietswerefedtogrowingcrossbredducks(CzechoslovakxCherryValleyhybrids)from28to63daysofage,whentwobirds(onemaleandonefemale)perpenwereslaughteredforcarcassevaluation.Dailyfeedintakeswere95,108,108,105and107gDManddailyliveweightgainswere26.1,29.1,28.3,27.1,27.6gforcontrol,D30,D45,D60andD100,respectively.Correspondingfeedconversionratioswere3.7,4.2,4.2,4.1,and4.2.Therewerenosignificantdifferencesinthecarcasstraitsbetweentreatments.Thedietwith100%replacementofsoyabeansbyduckweedwasthemostprofitableforthefarmer.