Effects of pre partum supplementation on milk yield, reproduction and milk quality of crossbred dairy cows raised in a peri urban farm of Morogoro town Tanzania

摘要

Anexperimentwascarriedouttoevaluatetheeffectsofpreandpost-partumconcentratesupplementationonmilkyield,milkcompositionandreproductiveperformanceofcrossbreddairycows.Fortyeightcowswereinvolvedinthestudy,andweredividedintothreegroupsaccordingtoconcentratesupplementation.Thefirsttreatment(HMR-PPP)wasfed4kg/dayhome-maderationduringpre-andpost-partumperiod.TreatmentHMR-PPandMB-PPwerefed4kg/dayhome-maderationandmaizebran,respectivelyduringthefirst24weeksoflactation.Pasturesampleswerecollectedfromthegrazingareaforchemicalanddigestibilitytests.Atotalof288milksampleswerecollectedatmonthlyintervalsandanalysedforbutterfat,solidsnotfatandtotalsolid.Daysfromcalvingtofirstinsemination(CFSI),calvingtoconceptioninterval(CCI),numberofservicesperconception(NSC)andcalvinginterval(CI)werecalculatedbasedonfarmrecords.GeneralLinearModelswereusedtoanalysethedata.nbsp;Theoverallcrudeprotein(CP),invitrodrymatterdigestibility(IVDMD)andinvitroorganicmatterdigestibility(IVOMD0percentagesofthepasturewere5.7±0.30,41.9±0.22and44.4±0.27,respectivelyandvariedbetweenseasons.Theoverallmeanmilkyieldwas6.5±0.10litres/day.Cowssupplementedwithhome-maderationduringpreandpost-partumhadthehighest(p0.05)milkyieldfollowedbypost-partumsupplementedcowswithhome-maderation.TheoverallmeanCFSI,CCI,NSCandCIwere96.1±0.02days,129.8±6.92days,1.74±0.01and410.2±0.00days,respectively.Concentratesupplementationbeforecalvingincreasedmilkyieldbutdidnotaffectmilkcompositionandreproductiveperformanceoflactatingcows.nbsp;