EstradiolCorpus LuteumProgesterone CongenersMifepristoneProgestinsEstrusLuteinizing HormonePregnancyUterusOvariectomyLuteal PhasePregnancy, AnimalOvulationReceptors, EstrogenEndometriumOvaryHormone AntagonistsEstrogensDinoprostMenstrual CycleHydroxyprogesteronesLuteal CellsPseudopregnancyChorionic GonadotropinFollicle Stimulating HormoneGonanesGranulosa Cells20-alpha-DihydroprogesteroneGonadal Steroid HormonesOvarian FollicleTreatment OutcomeSteroidsNorpregnadienesOviductsBreast NeoplasmsSheepEstrous CycleAdministration, IntravaginalFollicular PhaseCastrationLuteolysisTime FactorsPregnenoloneProlactin20-Hydroxysteroid DehydrogenasesDose-Response Relationship, DrugMyometriumOxytocinCattle3-Hydroxysteroid DehydrogenasesRadioimmunoassayGonadotropin-Releasing HormoneAndrostenedioneTestosterone5-alpha-DihydroprogesteroneDiestrusPregnancy MaintenancePregnanoloneProgesterone-Binding GlobulinMedroxyprogesteroneEmbryo ImplantationProgesterone ReductaseMenstruationMedroxyprogesterone AcetateAnestrusImmunohistochemistryProstaglandins FEstroneEstrus SynchronizationProestrusRNA, MessengerLabor, ObstetricDouble-Blind MethodPregnanedionesPregnanediolCells, CulturedCorpus Luteum MaintenancePostpartum PeriodHormonesCholesterol Side-Chain Cleavage EnzymeGonadotropins, Equine17-alpha-HydroxyprogesteroneDrug ImplantsFollicular FluidReceptors, EstradiolInsemination, ArtificialSwineDydrogesteroneReceptors, OxytocinOvulation InductionDeciduaPregnancy TestsEstrogen Receptor alphaNorethindroneSexual Maturation20-alpha-Hydroxysteroid DehydrogenaseEstrenesPregnanesEmbryo Implantation, DelayedTheca Cells