Chorionic GonadotropinChorionic Gonadotropin, beta Subunit, HumanGonadotropinsReceptors, LHGonadotropins, EquineReceptors, GonadotropinChoriocarcinomaGlycoprotein Hormones, alpha SubunitLuteinizing HormoneGonadotropins, PituitaryFollicle Stimulating HormonePregnancyOvulationOvaryProgesteroneGonadotropin-Releasing HormoneLeydig CellsTrophoblastic NeoplasmsTestosteronePregnancy TestsOvarian FollicleCorpus LuteumGranulosa CellsHydatidiform MoleEstradiolPregnancy-Associated Plasma Protein-APregnancy Trimester, FirstOvulation InductionPregnancy, EctopicReceptors, FSHTestisPituitary GlandUterine NeoplasmsReproductive Control AgentsEstriolHormones, EctopicPlacentaalpha-FetoproteinsGestational Trophoblastic DiseaseSuperovulationLuteinizing Hormone, beta SubunitTrophoblastsHypogonadismPlacental LactogenFertility Agents, FemaleHorsesMenotropinsFollicle Stimulating Hormone, beta SubunitInsemination, ArtificialLuteinizationNuchal Translucency MeasurementEstrusTesticular NeoplasmsInhibinsDown SyndromeRadioimmunoassaySexual MaturationTheca CellsFertilization in VitroPregnancy Tests, ImmunologicLeydig Cell TumorSteroidsFluoroimmunoassayProlactinImmunoassayHypophysectomyAbortifacient Agents, NonsteroidalPrenatal DiagnosisRNA, MessengerPerissodactylaPregnancy Trimester, SecondLeuprolideOocytesCyclic AMPNeoplasms, Germ Cell and EmbryonalPeptide FragmentsSwineMolecular Sequence DataTime FactorsCells, CulturedLuteal CellsPituitary Hormone-Releasing HormonesEmbryo ImplantationAndrostenedioneFollicular Phase3-Hydroxysteroid DehydrogenasesGerminomaBiological AssayHormone AntagonistsPregnancy RateCattle8-Bromo Cyclic Adenosine MonophosphateImmunoradiometric AssayPregnancy, TubalEstrus SynchronizationCorpus Luteum MaintenanceLuteal PhaseSeminomaThyrotropinReceptors, LHRH