Receptors, ProgesteroneBreast NeoplasmsReceptors, EstrogenEstradiolProtein IsoformsCorpus LuteumProgesterone CongenersMifepristoneProgestinsEstrusLuteinizing HormonePregnancyUterusOvariectomyLuteal PhasePregnancy, AnimalOvulationEndometriumOvaryHormone AntagonistsEstrogensDinoprostMenstrual CycleHydroxyprogesteronesLuteal CellsPseudopregnancyChorionic GonadotropinFollicle Stimulating HormoneGonanesGranulosa Cells20-alpha-DihydroprogesteroneRNA, MessengerOvarian FollicleGonadal Steroid HormonesIsoenzymesSteroidsNorpregnadienesOviductsSheepFollicular PhaseEstrous CycleLuteolysisCastrationCattleMolecular Sequence DataMyometriumAdministration, IntravaginalProlactinPregnenolone20-Hydroxysteroid Dehydrogenases3-Hydroxysteroid DehydrogenasesOxytocinRadioimmunoassayImmunohistochemistryCells, CulturedAlternative SplicingAndrostenedioneGonadotropin-Releasing HormoneTestosterone5-alpha-DihydroprogesteroneDiestrusPregnancy MaintenanceAmino Acid SequenceProgesterone-Binding GlobulinMedroxyprogesteronePregnanoloneTime FactorsProgesterone ReductaseEmbryo ImplantationMenstruationAnestrusMedroxyprogesterone AcetateBase SequenceProstaglandins FEstroneProestrusEstrus SynchronizationLabor, ObstetricReverse Transcriptase Polymerase Chain ReactionPregnanediolPregnanedionesDose-Response Relationship, DrugCorpus Luteum MaintenanceBlotting, WesternHormonesCholesterol Side-Chain Cleavage EnzymePostpartum PeriodGonadotropins, EquineGene Expression Regulation17-alpha-HydroxyprogesteroneFollicular FluidReceptors, EstradiolSwineEstrogen Receptor alphaDeciduaInsemination, ArtificialDydrogesteroneReceptors, OxytocinDrug ImplantsPregnancy Tests