Receptors, ProgesteroneBreast NeoplasmsReceptors, EstrogenEstradiolCorpus LuteumProgesterone CongenersMifepristoneProgestinsEstrusLuteinizing HormoneUterusPregnancyOvariectomyLuteal PhasePregnancy, AnimalOvulationEndometriumOvaryHormone AntagonistsEstrogensDinoprostMenstrual CycleHydroxyprogesteronesLuteal CellsPseudopregnancyChorionic GonadotropinFollicle Stimulating HormoneGonanesGranulosa Cells20-alpha-DihydroprogesteroneGonadal Steroid HormonesOvarian FollicleNorpregnadienesOviductsSteroidsEstrous CycleFollicular PhaseSheepLuteolysisCastrationAdministration, IntravaginalPregnenolone20-Hydroxysteroid DehydrogenasesMyometriumProlactinOxytocin3-Hydroxysteroid DehydrogenasesRadioimmunoassayCattleAndrostenedione5-alpha-DihydroprogesteroneGonadotropin-Releasing HormoneTestosteroneDiestrusPregnancy MaintenanceProgesterone-Binding GlobulinMedroxyprogesteronePregnanoloneProgesterone ReductaseEmbryo ImplantationMenstruationAnestrusMedroxyprogesterone AcetateProstaglandins FEstroneProestrusEstrus SynchronizationLabor, ObstetricPregnanediolImmunohistochemistryPregnanedionesRNA, MessengerCorpus Luteum MaintenanceCholesterol Side-Chain Cleavage EnzymePostpartum PeriodGonadotropins, EquineHormones17-alpha-HydroxyprogesteroneFollicular FluidTime FactorsReceptors, EstradiolInsemination, ArtificialDydrogesteroneDeciduaReceptors, OxytocinDrug ImplantsPregnancy TestsCells, CulturedOvulation InductionSexual MaturationEstrogen Receptor alphaNorethindrone20-alpha-Hydroxysteroid DehydrogenaseEstrenesDose-Response Relationship, DrugEmbryo Implantation, DelayedPregnanesSwineTheca CellsSuperovulation