Indoleamine-Pyrrole 2,3,-DioxygenaseEstradiolCorpus LuteumProgesterone CongenersMifepristoneProgestinsEstrusLuteinizing HormoneUterusPregnancyOvariectomyLuteal PhasePregnancy, AnimalOvulationEndometriumReceptors, EstrogenOvaryHormone AntagonistsEstrogensDinoprostMenstrual CycleHydroxyprogesteronesLuteal CellsPseudopregnancyChorionic GonadotropinFollicle Stimulating HormoneGonanesGranulosa Cells20-alpha-DihydroprogesteroneGonadal Steroid HormonesOvarian FollicleNorpregnadienesOviductsSteroidsEstrous CycleFollicular PhaseSheepLuteolysisCastrationAdministration, IntravaginalPregnenoloneBreast Neoplasms20-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, Estradiol