Establishment of the metabolic profile: an indicator for monitoring resumption of postpartum ovarian activity in dairy cows in the eastern side of Algeria

摘要

Therelationshipbetweensomeindicatorsofenergystatusandpostpartumovarianresumptionwasassessedin34dairycowsdistributedovertwoherdsineasternAlgeria.Themeasurementsofketonebodies(?-hydroxybutyrateinserumandacetoacetateinmilk)andtotalcholesterolinserumat15,30,and50dayspostpartum,andofglucoseinserumat50dayspostpartum,werecarriedout.Furthermore,bloodprogesteronewasassayedtodetermineovarianactivityresumptionduringthefirst50dayspostpartum.Cowshavebeenallocated,accordingtotheirprogesteronebloodconcentration(or1ng/ml)upto50dayspostpartum,into2groups:earlyresumption(RP)groupandlateornoresumption(RTN)group.nbsp;nbsp;ThepercentageofRPgroupwaslowerthanthenormalvaluesoughtindairyherds(57,6vs.82%),expressingadelayedpostpartumovarianresumption.Thepostpartummetabolicprofiledidnotdiffersignificantlybetweengroups(p0,05),whereas,onlymean?-hydroxybutyratenbsp;serumconcentrationwassignificantlyhigherinRPgroupthanRTNgroup.The?-hydroxybutyrateseemedtobe,atthisparticulartime,moreinvolvedasenergeticsubstrateindairycowswithadelayedcalving#8211;firstovulationpostpartuminterval;sothesefindingscouldreflecttheeffectofamoredeficientenergystatusinthisgroupofcows.Furthermore,resumptionofovarianactivityappearedtobesignificantlyinfluencedbymanagementofdairyherds(p=0,018).nbsp;Theuseofbiochemicalindicatorstomonitorenergystatushasproventobeaninterestingtooltoassessresumptionofovarianactivityduringthepostpartumperiodofdairycows.