EstradiolCorpus LuteumProgesterone CongenersMifepristoneProgestinsEstrusLuteinizing HormonePregnancyUterusOvariectomyLuteal PhasePregnancy, AnimalOvulationEndometriumReceptors, EstrogenOvaryHormone AntagonistsEstrogensDinoprostMenstrual CycleHydroxyprogesteronesLuteal CellsPseudopregnancyChorionic GonadotropinFollicle Stimulating HormoneGonanesGranulosa Cells20-alpha-DihydroprogesteroneGonadal Steroid HormonesOvarian FollicleNorpregnadienesOviductsSteroidsEstrous CycleSheepFollicular PhaseLuteolysisCastrationBreast NeoplasmsAdministration, IntravaginalPregnenolone20-Hydroxysteroid DehydrogenasesMyometriumProlactinOxytocin3-Hydroxysteroid DehydrogenasesCattleRadioimmunoassayAndrostenedione5-alpha-DihydroprogesteroneGonadotropin-Releasing HormoneTestosteroneDiestrusPregnancy MaintenanceProgesterone-Binding GlobulinMedroxyprogesteronePregnanoloneProgesterone ReductaseEmbryo ImplantationMenstruationAnestrusMedroxyprogesterone AcetateProstaglandins FTime FactorsRNA, MessengerEstroneProestrusEstrus SynchronizationImmunohistochemistryLabor, ObstetricPregnanediolPregnanedionesCorpus Luteum MaintenanceCholesterol Side-Chain Cleavage EnzymePostpartum PeriodGonadotropins, EquineHormones17-alpha-HydroxyprogesteroneFollicular FluidReceptors, EstradiolCells, CulturedInsemination, ArtificialDydrogesteroneDeciduaReceptors, OxytocinDrug ImplantsPregnancy TestsOvulation InductionDose-Response Relationship, DrugSexual MaturationEstrogen Receptor alphaNorethindrone20-alpha-Hydroxysteroid DehydrogenaseSwineEstrenesEmbryo Implantation, DelayedPregnanesTheca CellsSuperovulationGonadotropins, Pituitary