OxytocinOxytocicsVasotocinVasopressinsMilk EjectionSupraoptic NucleusPituitary Gland, PosteriorNeurophysinsDinoprostUterine ContractionHistamine ReleaseMyometriumLabor, ObstetricCalciumOrnipressinPregnancyUterusParaventricular Hypothalamic NucleusProgesteroneHypothalamusRats, Sprague-DawleyLactationEstrusCells, CulturedLabor, InducedDelayed-Action PreparationsNeurotransmitter AgentsTime FactorsCorpus LuteumDose-Response Relationship, DrugRats, WistarSheepLuteolysisPregnancy, AnimalNeuronsMaternal BehaviorRyanodine Receptor Calcium Release ChannelKineticsRadioimmunoassayPair BondHormone AntagonistsProstaglandins FSocial BehaviorCattleNeurosecretionEndometriumTocolytic AgentsLypressinElectric StimulationPostpartum HemorrhageVirus ReleaseRats, Inbred StrainsMicrodialysisAcetylcholineLabor Stage, ThirdSynaptic TransmissionUterine InertiaEstradiolNorepinephrineNeurosecretory Systems