Stress, PsychologicalBuffersStress, PhysiologicalRestraint, PhysicalCorticosteroneDepressionModels, PsychologicalDisease Models, AnimalBehavior, AnimalOxidative StressRats, WistarRats, Sprague-DawleyTromethamineHydrogen-Ion ConcentrationHEPESKineticsCalciumOsmolar ConcentrationElectrophoresis, CapillaryTemperatureBicarbonatesChromatography, High Pressure LiquidSolubilityDrug StabilityPhosphatesMolecular WeightEgtazic AcidEdetic AcidCattleIndicators and ReagentsSpectrophotometry, UltravioletElectrophoresis, Polyacrylamide GelChelating Agents