OvariectomyHysterectomyPyometraCat DiseasesDog DiseasesDogsCatsCastrationEstradiolEstrogensOvaryProgesteroneUterusEstrusLuteinizing HormoneDiestrusFollicle Stimulating HormoneOsteoporosisRats, Sprague-DawleyOrgan SizeSexual MaturationEstrogen Replacement TherapyFemurPregnancy, AnimalEstrous CycleGonadal Steroid HormonesBone DensityProestrusBone ResorptionMammary Neoplasms, ExperimentalOvulationTestosteroneBody WeightTibiaBone and BonesSex CharacteristicsAnestrusPituitary GlandBone Diseases, MetabolicPerphenazineProlactinPregnancyDrug ImplantsEstrogen Receptor alphaOrchiectomyRats, Wistar