Estrous CyclePregnancyPregnancy, AnimalEstrusPregnancy Trimester, FirstProgesteronePregnancy ComplicationsPregnancy OutcomeUterusCorpus LuteumEndometriumAbortion, SpontaneousDiestrusPregnancy, EctopicEmbryo ImplantationPregnancy ProteinsPregnancy TestsCell CycleEstradiolOvaryDeciduaProestrusGestational AgeOvulationPregnancy RateMenstrual CycleDinoprostPregnancy Trimester, ThirdPregnancy Trimester, SecondLuteinizing HormonePregnancy TrimestersAbortifacient Agents, NonsteroidalCattleOvariectomyLuteal PhaseSheepPregnancy Complications, CardiovascularOvarian FollicleChorionic GonadotropinPregnancy, MultiplePlacentaPseudopregnancyPregnancy in DiabeticsLuteolysisPregnancy, TubalFallopian TubesPregnancy Complications, NeoplasticFollicle Stimulating HormoneMyometriumAbortion, InducedPregnancy Complications, InfectiousAbortifacient AgentsAbortion, ThreatenedUltrasonography, PrenatalMisoprostolRNA, MessengerTime FactorsPregnancy in AdolescenceSwineFollicular PhaseOxytocinPregnancy MaintenanceVacuum CurettageCorpus Luteum MaintenanceFetal DeathTrophoblastsEmbryo LossAbortion, HabitualPre-EclampsiaLuteal CellsFertilityImmunohistochemistryAdministration, IntravaginalEmbryo TransferEstrus SynchronizationPregnancy, High-RiskPregnancy Tests, ImmunologicFertilization in VitroGonadotropin-Releasing HormoneReproductionInfant, NewbornSuppressor Factors, ImmunologicChaperonin 10InhibinsInsemination, ArtificialAbortion, MissedUterine HemorrhageAbortion, TherapeuticRadioimmunoassayEstrogensMaternal-Fetal ExchangeVaginaPrenatal Exposure Delayed EffectsPregnancy Complications, HematologicAnestrusPregnancy, UnplannedFetal DevelopmentPlacentationParityInfertility, Female