Effect of Polyethylene glycol (PEG, MW6000) on in vitro digestibility of Calliandra calothyrsus alone or mixed with Brachiaria ruziziensis, Trypsacum laxum or Pennisetum purpureum, in dry and rainy seasons in West Cameroon

摘要

EffectofPolyethyleneglycol(PEG,MW6000)oninvitrodigestibilityofCalliandracalothyrsusaloneormixedwithBrachiariaruziziensis,TrypsacumlaxumorPennisetumpurpureum,indryandrainyseasonsinWestCameroonTheeffectofBrachiariaruziziensis,TrypsacumlaxumorPennisetumpurpureumontheinvitrodigestibilityofCalliandracalothyrsus,inpresenceorabsenceofPolyethyleneglycol(PEG,MW6000),wasstudiedindryandrainyseasonsinWestCameroon.ThisstudyrevealedthatadditionofPEGincreasedthegasproductionofCalliandracalothyrsusfrom27.6to34.9ml/200mgDMintherainyseasonandfrom27.7to33.8ml/200mgDMindryseason.InpresenceofBrachiariaruziziensis,additionofPEGsignificantlyincreasedthegasandshortchainfattyacid(SCFA)productionintherainyseasonandinthedryseasoninthepresenceofTrypsacumlaxumandPennisetumpurpureum.AdditionofPEGdecreasedthepartitioningfactor(PF)ofCalliandracalothyrsusfrom6.81to3.90mg/mlindryseasonandfrom7.61to3.81mg/mlinrainyseason.InthepresenceofgrassesandinthepresenceorabsenceofPEG,thePFofCalliandracalothyrsusvariedbetween4.62and6.42mg/mlinthedryandrainyseasons.Therewasnosignificantdifferencebetweenthemicrobialmass(MM)yieldedfromthedegradationofCalliandracalothyrsusinthepresenceorintheabsenceofPEG,TrypsacumlaxumandPennisetumpurpureumbetweenthedryandtherainyseason.Theorganicmatterdigestibility(OMD)ofCalliandracalothyrsuswassignificantlyhigherinthedryseasoninthepresenceofTrypsacumlaxum,PennisetumpurpureumandPEG.IntheabsenceofgrassestheOMDofCalliandracalothyrsuswasbothsignificantlyhigherintheabsenceofPEGandinthepresenceofPEGintherainyseasonascomparedtothedryseason.