Gonadal Steroid HormonesEstradiolTestosteroneSex CharacteristicsOrchiectomyOvariectomySteroidsHormonesProgesteroneLuteinizing HormoneDihydrotestosteroneGonadotropin-Releasing HormoneFollicle Stimulating HormoneReceptors, SteroidCastrationEstrogensGonadal HormonesAndrogensThyroid HormonesSex DifferentiationPituitary GlandSexual MaturationEstrous CycleLeuprolideTestosterone PropionateEcdysoneAdrenocorticotropic HormoneOvaryHypothalamusReceptors, ProgesteronePreoptic AreaGonadsHypogonadismReceptors, AndrogenFollicle Stimulating Hormone, beta SubunitPituitary Hormone-Releasing HormonesHydrocortisoneSexual Behavior, AnimalPituitary Gland, AnteriorParathyroid HormoneMenstrual CycleGonadotropins, PituitaryEcdysteroneReceptors, EstrogenKisspeptinsDehydroepiandrosteroneRNA, MessengerReceptors, Thyroid HormoneAdrenal GlandsGonadotropinsHypothalamus, MiddleRadioimmunoassayReproductionProlactinArcuate NucleusReceptors, GlucocorticoidNeurokinin BTestisEstrusRats, Sprague-DawleyHuman Growth HormoneNeurosecretory SystemsGene Expression RegulationFollicular PhaseReceptors, LHRHEstrogen Receptor alphaPregnancyBrainGlucocorticoidsAndrostenedioneDexamethasonePituitary HormonesVocalization, AnimalAnalysis of VariancePregnenoloneSheepMetamorphosis, BiologicalProgestinsEstroneUterusAndrosteroneTriiodothyronineHormone Replacement TherapyEtiocholanoloneHormone Antagonists3-Hydroxysteroid DehydrogenasesSteroid 21-HydroxylaseAgingImmunohistochemistrySex FactorsRats, Inbred StrainsNeuronsJuvenile Hormones17-Hydroxysteroid DehydrogenasesAdrenal Cortex HormonesHydroxyprogesteronesAnabolic AgentsMolecular Sequence DataMifepristoneIn Situ Hybridization