ProestrusEstrous CycleEstrusDiestrusProgesteroneEstradiolMetestrusOvaryOvulationCorpus LuteumLuteinizing HormoneOvariectomyCell CycleUterusFollicle Stimulating HormoneOvarian FolliclePregnancy, AnimalPregnancyGonadotropin-Releasing HormoneProlactinEndometriumLuteolysisDinoprostGonadal Steroid HormonesEstrogensCattleRadioimmunoassayVaginaPituitary Gland, AnteriorRats, Sprague-DawleyEtherLuteal PhaseReproductionPseudopregnancyRNA, MessengerPituitary GlandSheepMenstrual CycleFollicular AtresiaSexual MaturationFollicular PhaseRats, WistarInhibinsMedian EminenceTime FactorsEstrus SynchronizationGonadotropinsRats, Inbred StrainsHormone AntagonistsMifepristoneAnestrusMesocricetusBromocriptineImmunohistochemistryOxytocinLuteal CellsSex CharacteristicsHypothalamusPreoptic AreaFallopian TubesSwineGranulosa CellsTestosteroneCastrationGenitalia, FemaleCell Cycle ProteinsEstrus DetectionChorionic GonadotropinFertilityOrgan SizeMyometriumIn Situ HybridizationPostpartum PeriodSexual Behavior, AnimalEmbryo ImplantationProstaglandins FEstrogen Receptor alphaCircadian RhythmGene Expression RegulationHypophysectomyPregnancy ProteinsEstradiol DehydrogenasesReceptors, ProgesteroneFollicular FluidSuperovulation3-Oxo-5-alpha-Steroid 4-DehydrogenaseCricetinaeEstrogen Receptor betaPregnenedionesAromataseInsemination, ArtificialDose-Response Relationship, DrugDrug ImplantsReceptors, Estrogen5-alpha-DihydroprogesteroneCitric Acid CycleAgingCorpus Luteum MaintenanceProgesterone CongenersMelengestrol Acetate