MenopauseMenopause, PrematureEstradiolEstrogen Replacement TherapyOvariectomyProgestinsProgesterone CongenersEstrogensCorpus LuteumPostmenopausePerimenopauseMifepristoneOvaryMenstrual CycleLuteinizing HormonePregnancyEstrusHot FlashesUterusLuteal PhaseHormone Replacement TherapyFollicle Stimulating HormonePrimary Ovarian InsufficiencyReceptors, EstrogenPremenopauseClimactericOvulationEndometriumGonadal Steroid HormonesMenstruationMenarchePregnancy, AnimalBreast NeoplasmsHormone AntagonistsHysterectomyOvarian FollicleDinoprostHydroxyprogesteronesLuteal CellsReproductive HistoryPseudopregnancyOsteoporosis, PostmenopausalChorionic GonadotropinAge FactorsWomen's HealthGonanesFollicular PhaseGranulosa Cells20-alpha-DihydroprogesteroneNorpregnadienesOviductsTestosteroneSteroidsMedroxyprogesterone AcetateAgingEstrous CycleEstroneSheepLuteolysisPregnanediolTime FactorsCastrationHormonesMedroxyprogesteroneAndrostenedioneRisk FactorsAdministration, IntravaginalPregnenolone20-Hydroxysteroid DehydrogenasesMyometriumProlactinOxytocinCyclohexenes3-Hydroxysteroid DehydrogenasesParityFertilityRadioimmunoassayEstrogens, Conjugated (USP)Cattle5-alpha-DihydroprogesteroneVinyl CompoundsGonadotropin-Releasing HormoneReproductionDiestrusPregnancy MaintenanceProgesterone-Binding GlobulinAnovulationPregnanoloneProgesterone ReductaseBone DensityEmbryo ImplantationAnestrusEstrogen Receptor alphaProstaglandins FNorethindroneImmunohistochemistryProestrusRNA, MessengerEstrus SynchronizationLabor, Obstetric