MyometriumUterusUterine ContractionLabor, ObstetricLeiomyomaUterine NeoplasmsPregnancyPregnancy, AnimalOxytocinEndometriumReceptors, OxytocinLabor OnsetProgesteroneOxytocicsEstradiolUterine DiseasesEmbryo ImplantationDeciduaParturitionOvariectomyCervix UteriTocolytic AgentsRNA, MessengerEstrusHysterectomyPlacentaDinoprostRelaxinProstaglandins FMenstrual CyclePseudopregnancyImmunohistochemistryObstetric Labor, PrematureLeiomyomatosisSheepEstrous CycleEstrogensCastrationPostpartum PeriodExtraembryonic MembranesGenitalia, FemaleMyomaGestational AgeMuscle, SmoothReverse Transcriptase Polymerase Chain ReactionFallopian TubesReceptors, ProstaglandinCesarean SectionIn Situ HybridizationVaginaReceptors, ProgesteroneGene ExpressionProstaglandinsBlotting, WesternRioprostilEndometritisMifepristoneGravidityOvaryReceptors, EstrogenEndometriosisReceptor, Galanin, Type 1Adrenergic beta-3 Receptor AgonistsTrophoblasts