Bone DensityPopulation DensityGenitalia, FemaleCentrifugation, Density GradientSex CharacteristicsSexual Behavior, AnimalSex FactorsReproductionLipoproteins, LDLTime FactorsCondoms, FemaleCell CountOvariectomyLipoproteins, HDLFertilityAbsorptiometry, PhotonAge FactorsBody WeightPregnancyCopulationEstradiolLipoproteins, VLDLInfertility, FemaleRats, Sprague-DawleyRisk FactorsMating Preference, AnimalCholesterolSex RatioOsteoporosisAgingAnalysis of VarianceOvaryReceptors, LDLPost-Synaptic DensityMicroscopy, ElectronLipoproteinsOrgan SizeOvipositionDensitometryCross-Sectional StudiesCells, CulturedApolipoproteinsLiverMice, Inbred C57BLImmunohistochemistrySexual MaturationEstrogensMammographyModels, BiologicalKineticsFemur NeckPhenotypeBone and BonesEstrous CyclePrevalenceTestosteroneSex AttractantsSeasonsRetrospective StudiesDisease Models, AnimalSpecies SpecificityCircumcision, FemaleRNA, MessengerDose-Response Relationship, DrugFemurAnimals, NewbornRats, WistarBone Diseases, MetabolicMolecular Sequence DataLumbar VertebraeGonadal Steroid HormonesLow Density Lipoprotein Receptor-Related Protein-1BrainLipidsApolipoprotein A-ICholesterol EstersBone Density Conservation AgentsQuestionnairesReference ValuesTomography, X-Ray ComputedProgesteroneBehavior, AnimalRabbitsRegression AnalysisMutationDendritic SpinesDietProspective StudiesSex DifferentiationPopulation DynamicsTreatment OutcomeOsteoporosis, PostmenopausalIncidenceGenotypeBody SizeUterusCrosses, GeneticFeeding BehaviorCase-Control StudiesSocial Dominance