Receptors, OxytocinOxytocinVasotocinMyometriumReceptors, VasopressinLabor, ObstetricDinoprostOxytocicsTocolytic AgentsEndometriumUterusUterine ContractionProgesteronePair BondReceptors, AngiotensinPregnancy, AnimalPregnancyVasopressinsSheepOrnipressinLuteolysisEstrusArvicolinaeLypressinSupraoptic NucleusNeurophysinsLabor OnsetBornanesArginine VasopressinCorpus LuteumParturitionSocial BehaviorReceptors, EstradiolClonixinHormone AntagonistsCorpus Luteum MaintenanceGroomingMaternal BehaviorOvariectomyMilk EjectionEstradiolAutoradiographyParaventricular Hypothalamic NucleusLactationLabor, InducedPituitary Gland, PosteriorRNA, MessengerLuteal PhaseAmnion