OvariectomyCastrationEstradiolEstrogensOvaryProgesteroneUterusEstrusLuteinizing HormoneDiestrusFollicle Stimulating HormoneRats, Sprague-DawleyOsteoporosisOrgan SizeSexual MaturationEstrogen Replacement TherapyFemurPregnancy, AnimalEstrous CycleGonadal Steroid HormonesBone DensityBone ResorptionProestrusBody WeightMammary Neoplasms, ExperimentalTestosteroneOvulationPregnancyTibiaBone and BonesSex CharacteristicsPituitary GlandBone Diseases, MetabolicAnestrusPerphenazineProlactinDrug ImplantsEstrogen Receptor alphaRats, WistarOrchiectomyOvarian FollicleTime FactorsMetestrusEstrogen Receptor betaSheepMethylnitrosoureaNorpregnenesTooth SocketGonadotropin-Releasing HormoneX-Ray MicrotomographyReceptors, EstrogenRats, Inbred StrainsRaloxifeneEstrogen AntagonistsBone Remodeling9,10-Dimethyl-1,2-benzanthraceneMetrial GlandGonadotropins, PituitaryAgingDisease Models, AnimalAlendronatePseudopregnancyGastric DilatationMammary Glands, AnimalPhytoestrogensMice, Inbred C57BLEmbryo Implantation, DelayedMedroxyprogesteroneRandom AllocationMaprotilineInhibinsOsteoclastsFeedbackBone Density Conservation AgentsVaginaRNA, MessengerOvum TransportHarderian GlandOsteoporosis, PostmenopausalCorpus LuteumStiflePituitary Hormone-Releasing HormonesCissusAdrenalectomySecretory RateLagomorphaStomach VolvulusModels, AnimalMesocricetusOsteogenesisMenopausePostpartum PeriodEthinyl EstradiolRadioimmunoassay