Ileal and in vitro digestibility in the pig of three floating aquatic macrophytes

摘要

GrowingwaterplantinpondsfertilizedwithpigmanureisonewayofrecyclingtheNgivenintheoriginalfeed.Eitherwaterhyacinth(Eichhorniacrassipes(Mart,EC),duckweed(Lemnaminor,L)orazolla(Azollaspp,A)grownonliquidpigslurryafterananaerobictreatmentweresundried,milledandincludedasanalternativesourceofNat0,100or200g/kginsugarcanemolassesandsoybeanmealdietsgiventopigs.NandOMcontent(g/kgindrybasisrespectively)ofmacrophyteswereEC,26.3and810;L,45.6and643;A,50,9and809.Nine45kgpigspreparedbyanileo-rectalanastomosisweredistributedatrandomtodietsin3digestiontrialsaccordingtoa3x3Latinsquaredesign.IlealOMbutnotNdigestibilityofthebasaldietwashighasexpected(OM,811-842;N,696-719g/kgrespectively).Invitroandinvivoilealproteindigestibilitywerelowestinwaterhyacinthandhighestinazolla(EC,412and162;L,674and560;A,701and646g/kgrespectively).IlealOMdigestibilitywaslessinfluencedbyazollathanbywaterhyacinthat200g/kglevelofinclusioninthediet(EC,739;L,769;A,778g/kg)thusindicatingthattheefficiencyofrecyclingtheexcretedNbythepigmaylargelydependonthetypeofmacrophytetobeusedforthispurpose.