Rats, Sprague-DawleyPregnancy, AnimalPregnancyUterine ContractionUterusMyometriumPlacentaMaternal-Fetal ExchangePrenatal Exposure Delayed EffectsFetusProgesteroneRats, Inbred StrainsPregnancy Complications, CardiovascularRats, WistarFetal WeightAbnormalities, Drug-InducedPlacental Function TestsGestational AgeLabor, ObstetricFetal ResorptionMifepristoneOrgan SizeCorpus LuteumGravidityPre-EclampsiaFetal DevelopmentOxytocinPregnancy ComplicationsBody WeightAnimals, NewbornOvum TransportHypertension, Pregnancy-InducedRelaxinEstradiolLitter SizeFetal Growth RetardationDiet, Protein-RestrictedEmbryonic and Fetal DevelopmentPlasma Volume20-Hydroxysteroid DehydrogenasesPlacental LactogenLactationTeratogens20-alpha-DihydroprogesteroneMetrial GlandMaternal ExposureTocolytic AgentsProstaglandins FCastrationAmniotic FluidLuteal CellsNG-Nitroarginine Methyl EsterDiestrusAlismataceaeBlood PressurePseudopregnancyOvaryRitodrineCervical Ripening20-alpha-Hydroxysteroid DehydrogenaseLuteolysisPregnancy in DiabeticsReceptors, OxytocinLiverCarcinoma 256, WalkerPlacental InsufficiencyFetal Nutrition DisordersParturitionNitric OxideRNA, MessengerKidneyPostpartum PeriodPregnancy ProteinsOvariectomyOncogene Proteins v-fosMenstruation-Inducing AgentsHydroxyprogesteronesNuclease Protection AssaysFetal DeathDibutyl PhthalateVasodilationEmbryo ImplantationHormone AntagonistsDose-Response Relationship, DrugVascular Endothelial Growth Factor Receptor-1ScandiumDinoprostProtein DeficiencyTime FactorsPhenylephrineDeciduaHematocritPyrrolidines