ParturitionLabor, ObstetricPregnancy, AnimalPregnancyPostpartum PeriodLactationMyometriumCervical RipeningOxytocinProgesteroneUterine ContractionPlacenta, RetainedLabor, InducedExtraembryonic MembranesUterusReceptors, OxytocinMacropodidaeColostrumCattleRelaxinAmnionMilkDinoprostFlumethasoneDystociaAnimals, SucklingLitter SizePlacentaPubic SymphysisGestational AgeObstetric Labor, PrematureProstaglandins FMammary Glands, AnimalCervix UteriMarsupialiaSheepEstrusOxytocicsAnimals, NewbornLabor OnsetParturient ParesisCarthamus tinctoriusMaternal BehaviorAmniotic FluidReproductionTerm BirthFetusCorpus LuteumMaternal-Fetal ExchangeCattle DiseasesArtiodactylaEstradiolProlactinEstroneSwineParityAnimal Nutritional Physiological PhenomenaChorionRadioimmunoassayBody WeightPinus ponderosaPlant PoisoningFetal DeathPinnipediaGoatsOvaryPuerperal InfectionRandom AllocationObstetric Labor ComplicationsTime FactorsCell Nucleus ShapeEndometritisLabor Stage, First20-alpha-DihydroprogesteroneMilk EjectionPregnancy MaintenanceDeciduaEmbryo Implantation, DelayedWeaningCell Nucleus DivisionThermometryAnimal FeedProstaglandinsDairyingRitodrineEstrous CycleReceptors, ProstaglandinUterine DiseasesProstaglandins F, SyntheticHydrocortisoneMaternal Nutritional Physiological PhenomenaChorioamnionitis20-Hydroxysteroid DehydrogenasesBirth WeightPremature BirthPregnancy ComplicationsCesarean SectionAbortion, VeterinaryLuteinizing HormoneFetal Membranes, Premature Rupture