Circadian RhythmProestrusDiestrusHydrocortisoneMelatoninTime FactorsLuteinizing HormoneSalivaSleepJet Lag SyndromeProlactinMedian EminenceEstrusProgesteronePhotoperiodWork Schedule ToleranceGonadotropin-Releasing HormoneEstrous CycleOvariectomyFeeding BehaviorWakefulnessMental FatigueEstradiolHumidityOvulationEnemaFollicle Stimulating HormoneAppointments and SchedulesHypothalamo-Hypophyseal SystemSeasonsFatigueIntubation, GastrointestinalAbdominal MusclesEatingRadioimmunoassayPituitary-Adrenal SystemSleep DeprivationBody TemperatureAnalysis of VarianceLightPineal GlandHeart RateBlood GlucoseCross-Over StudiesOvaryDrinkingHypothalamusWeatherPituitary GlandMesocricetusPeriodicityAppetiteBody Temperature RegulationAdrenocorticotropic HormoneEnergy IntakeSexual MaturationHypoglycemiaEpinephrineReference ValuesPregnancyPituitary Gland, AnteriorArousalRats, Inbred StrainsMental RecallCorticosteroneSexual Behavior, AnimalBudesonideSchoolsBehavior, AnimalInsulinFastingAge FactorsLactationRats, WistarExerciseColonoscopyBlood PressureSex FactorsWalkingGlucose Tolerance TestReproducibility of ResultsRandom AllocationRats, Sprague-DawleyAnimal FeedStatistics as TopicQuestionnairesWaterDietProspective StudiesCricetinaeNorepinephrineMotor ActivityAgingBody WeightCattleDose-Response Relationship, DrugDouble-Blind MethodBiological MarkersTemperatureNeurons