MyometriumCervix UteriUterine ContractionLabor, ObstetricUterusLeiomyomaUterine NeoplasmsUterine Cervical NeoplasmsPregnancyOxytocinPregnancy, AnimalLabor OnsetCervical RipeningReceptors, OxytocinParturitionOxytocicsEndometriumCervix MucusObstetric Labor, PrematureHysterectomyProgesteroneTocolytic AgentsRelaxinUterine Cervical DiseasesEstradiolRNA, MessengerExtraembryonic MembranesImmunohistochemistryUterine Cervical IncompetenceUterine DiseasesCarcinoma, Squamous CellUterine Cervical DysplasiaOvariectomyMenstrual CycleCervical Intraepithelial NeoplasiaVaginaGenitalia, FemaleDinoprostMyomaDeciduaPapillomaviridaeSheepGestational AgeVaginal SmearsProstaglandins FLeiomyomatosisEstrusReverse Transcriptase Polymerase Chain ReactionMuscle, SmoothCesarean SectionPostpartum PeriodPlacentaVaginal NeoplasmsRioprostilReceptors, ProstaglandinAmnionReceptor, Galanin, Type 1Adrenergic beta-3 Receptor AgonistsHameliaBlotting, WesternReceptor, Galanin, Type 2