PregnancyPregnancy, AnimalPregnancy OutcomePregnancy ComplicationsPregnancy, EctopicEstradiolPregnancy Trimester, FirstPregnancy RatePregnancy TestsPregnancy Trimester, ThirdUterusCorpus LuteumPregnancy TrimestersPregnancy Complications, CardiovascularPregnancy, MultipleProgesterone CongenersMifepristoneEstrusPregnancy, TubalPregnancy in DiabeticsProgestinsPregnancy Trimester, SecondPregnancy Complications, NeoplasticEndometriumPregnancy ProteinsLuteinizing HormonePregnancy in AdolescencePregnancy Complications, InfectiousLuteal PhaseAbortion, SpontaneousOvariectomyChorionic GonadotropinOvaryPregnancy MaintenanceGestational AgeOvulationEmbryo ImplantationPregnancy, High-RiskPlacentaPregnancy, UnplannedHormone AntagonistsMenstrual CyclePregnancy, UnwantedReceptors, EstrogenPseudopregnancyDinoprostEstrogensFollicle Stimulating HormoneFetal DeathFertilization in VitroPregnancy Complications, HematologicHydroxyprogesteronesMyometriumPregnancy, ProlongedEmbryo TransferLabor, ObstetricLuteal CellsEstrous CycleInfant, NewbornPre-EclampsiaSheepOvarian FolliclePregnancy, TwinDecidua20-alpha-DihydroprogesteroneGonadal Steroid HormonesGonanesGranulosa CellsAdministration, IntravaginalAbortion, InducedInsemination, ArtificialLactationProlactinSteroidsFollicular PhasePregnancy, AbdominalOxytocinCattleNorpregnadienesLuteolysisPregnancy Complications, ParasiticOviductsUltrasonography, PrenatalTime FactorsCastrationParityOvulation InductionRadioimmunoassayMaternal-Fetal ExchangeInfertility, FemaleFertilityGonadotropin-Releasing HormonePrenatal CareMenstruationBreast NeoplasmsPrenatal Exposure Delayed EffectsBirth Weight3-Hydroxysteroid Dehydrogenases20-Hydroxysteroid DehydrogenasesPregnenolone