Chorionic GonadotropinGlycoprotein Hormones, alpha SubunitChorionic Gonadotropin, beta Subunit, HumanGonadotropinsReceptors, LHGonadotropins, EquineReceptors, GonadotropinChoriocarcinomaLuteinizing HormoneFollicle Stimulating HormoneGonadotropins, PituitaryOvulationTrophoblastic NeoplasmsPregnancyOvaryLeydig CellsProgesteroneGonadotropin-Releasing HormoneTestosteronePregnancy TestsCorpus LuteumOvarian FollicleHydatidiform MoleGranulosa CellsEstradiolUterine NeoplasmsReproductive Control AgentsOvulation InductionTestisPregnancy, EctopicEstriolGestational Trophoblastic DiseaseReceptors, FSHHormones, Ectopicalpha-FetoproteinsPituitary GlandPregnancy Trimester, FirstPlacentaSuperovulationTrophoblastsHypogonadismFertility Agents, FemaleMenotropinsLuteinizationPregnancy-Associated Plasma Protein-ATesticular NeoplasmsInsemination, ArtificialPregnancy Tests, ImmunologicPlacental LactogenEstrusLeydig Cell TumorLuteinizing Hormone, beta SubunitTheca CellsFollicle Stimulating Hormone, beta SubunitInhibinsFertilization in VitroRadioimmunoassayFluoroimmunoassaySexual MaturationSteroidsImmunoassayProlactinHypophysectomyHorsesDown SyndromeLuteal CellsNeoplasms, Germ Cell and EmbryonalAbortifacient Agents, NonsteroidalPregnancy Trimester, SecondImmunoradiometric AssayRNA, MessengerCorpus Luteum Maintenance3-Hydroxysteroid DehydrogenasesLeuprolideCyclic AMPGerminomaAndrostenedioneOocytes8-Bromo Cyclic Adenosine MonophosphatePeptide FragmentsHormone AntagonistsPregnancy RateFollicular PhaseSeminomaPituitary Hormones, AnteriorLuteal PhaseSwinePrenatal DiagnosisBucladesineHormonesPituitary Hormone-Releasing HormonesInfertility, FemaleEmbryo ImplantationEstrus SynchronizationThyrotropinCattleEmbryo TransferCastrationCumulus CellsCells, Cultured