Estrous CycleUterusEstrusProgesteroneCell CycleCorpus LuteumDiestrusPregnancy, AnimalEstradiolOvaryProestrusPregnancyEndometriumOvulationOvariectomyDinoprostLuteinizing HormoneOvarian FollicleCattleLuteolysisEmbryo ImplantationMyometriumSheepLuteal PhaseFollicle Stimulating HormoneMenstrual CycleOxytocinFollicular PhaseFallopian TubesPseudopregnancyEstrus SynchronizationRNA, MessengerGenitalia, FemaleUterine ContractionVaginaAnestrusSwineReproductionLuteal CellsEstrogensGonadotropin-Releasing HormoneTime FactorsProstaglandins FPostpartum PeriodInhibinsFertilityUterine DiseasesImmunohistochemistryRadioimmunoassayPregnancy ProteinsSexual MaturationDeciduaCell Cycle ProteinsCervix UteriEstrus DetectionFollicular AtresiaGonadal Steroid HormonesIn Situ HybridizationSuperovulationOrgan SizeInsemination, ArtificialRats, Sprague-DawleyPituitary Gland, AnteriorCastrationFollicular FluidGonadotropinsCorpus Luteum MaintenancePregnenedionesGene ExpressionPituitary GlandGene Expression RegulationReverse Transcriptase Polymerase Chain ReactionGranulosa CellsProgesterone CongenersProlactinReceptors, OxytocinDrug ImplantsRandom AllocationAbortifacient AgentsChorionic GonadotropinUterine NeoplasmsOviducts5-alpha-DihydroprogesteroneCitric Acid CycleReceptors, EstradiolMelengestrol AcetateHysterectomyHormonesReceptors, ProgesteroneRats, Inbred StrainsProgestinsTheca Cells20-alpha-Hydroxysteroid DehydrogenaseHorsesMesocricetusCloprostenolEpitheliumPregnancy MaintenanceSus scrofaRats, Wistar