Gonadal Steroid HormonesEstradiolTestosteroneSex CharacteristicsOvariectomyOrchiectomySteroidsProgesteroneHormonesLuteinizing HormoneFollicle Stimulating HormoneDihydrotestosteroneGonadotropin-Releasing HormoneEstrogensCastrationReceptors, SteroidReceptors, EstradiolGonadal HormonesAndrogensEstrous CyclePituitary GlandSex DifferentiationSexual MaturationThyroid HormonesOvaryReceptors, EstrogenLeuprolideHypothalamusTestosterone PropionatePreoptic AreaReceptors, ProgesteroneEthinyl EstradiolAdrenocorticotropic HormoneMenstrual CycleEcdysoneHypogonadismSexual Behavior, AnimalReceptors, AndrogenPituitary Hormone-Releasing HormonesGonadsPituitary Gland, AnteriorHydrocortisoneEstrogen Receptor alphaFollicle Stimulating Hormone, beta SubunitDehydroepiandrosteroneEstroneGonadotropins, PituitaryGonadotropinsRNA, MessengerEstrusProlactinRadioimmunoassayUterusKisspeptinsParathyroid HormoneEcdysteroneHypothalamus, MiddleAndrostenedioneFollicular PhaseRats, Sprague-DawleyReproductionAdrenal GlandsPregnancyReceptors, Thyroid HormoneArcuate NucleusEstradiol CongenersTestisGene Expression RegulationEstradiol DehydrogenasesSex Hormone-Binding GlobulinReceptors, GlucocorticoidSheepReceptors, LHRHNeurokinin BNeurosecretory SystemsHuman Growth HormoneAromataseProgestinsBrainAnalysis of Variance17-Hydroxysteroid DehydrogenasesEstrogen Receptor betaDexamethasoneGlucocorticoidsEstradiol AntagonistsHormone AntagonistsPregnenoloneHormone Replacement TherapyPituitary HormonesEstrogen AntagonistsVocalization, AnimalAgingEstriolEndometriumRats, Inbred StrainsAndrosteroneTriiodothyronine3-Hydroxysteroid DehydrogenasesImmunohistochemistryOvulation