EstrogensReceptors, EstrogenEstrogen Receptor alphaEstradiolEstrogen Receptor betaEstrogens, Conjugated (USP)OvariectomyProgestinsUterusProgesterone CongenersCorpus LuteumMifepristoneEstrusBreast NeoplasmsLuteinizing HormonePregnancyEstrogens, CatecholEndometriumSelective Estrogen Receptor ModulatorsOvaryLuteal PhasePregnancy, AnimalOvulationEstrogens, Non-SteroidalTamoxifenMenstrual CycleEstroneHormone AntagonistsGonadal Steroid HormonesCastrationDiethylstilbestrolFollicle Stimulating HormoneOviductsAromataseHydroxyprogesteronesDinoprostEstrous CyclePseudopregnancyChorionic GonadotropinGranulosa CellsEstradiol CongenersLuteal CellsSteroidsTestosteroneGonanesOvarian Follicle20-alpha-DihydroprogesteroneRNA, MessengerProlactinNorpregnadienesMedroxyprogesterone AcetateSheepFollicular PhaseImmunohistochemistryMyometriumAndrostenedioneMedroxyprogesteroneRadioimmunoassayReceptors, ProgesteroneLuteolysisPostmenopauseReceptors, EstradiolOxytocin3-Hydroxysteroid DehydrogenasesGonadotropin-Releasing Hormone20-Hydroxysteroid DehydrogenasesAdministration, IntravaginalPregnenoloneCattleDiestrusMenstruationDrug ImplantsTime FactorsDose-Response Relationship, Drug5-alpha-DihydroprogesteroneCells, CulturedEmbryo ImplantationEthinyl EstradiolHormonesProestrusProgesterone ReductaseDydrogesteroneNeoplasms, Hormone-DependentMenopauseProgesterone-Binding GlobulinPregnancy MaintenancePregnanoloneGene Expression RegulationPregnanediolDihydrotestosteroneReverse Transcriptase Polymerase Chain ReactionProstaglandins FRats, Sprague-DawleyMammary Glands, AnimalPhytoestrogensSexual MaturationNorethindroneAnestrusEstrus SynchronizationLabor, Obstetric