Animals, SucklingAnimals, NewbornLactationMaternal BehaviorPregnancyMaternal DeprivationLitter SizeMilkFur SealsSeals, EarlessPrenatal Exposure Delayed EffectsRats, Sprague-DawleyBody WeightAnimal Population GroupsWeaningHerpestidaeMaternal-Fetal ExchangeBehavior, AnimalGroomingOrgan SizePaternal BehaviorMaternal ExposurePregnancy, AnimalVocalization, AnimalRats, Long-EvansRats, WistarReproductionCorticosteroneHandling (Psychology)Maternal Nutritional Physiological PhenomenaDisease Models, AnimalMammary Glands, AnimalAgingAnxiety, SeparationRats, Inbred StrainsFetusImmunity, Maternally-AcquiredHypoxia-Ischemia, BrainMilk EjectionHyperoxiaMotor ActivityGrowthBrainArvicolinaeOdorsMice, Inbred C57BLSea LionsNutrition DisordersSucking BehaviorFertilityUltrasonicsDog DiseasesLiverTime FactorsFeeding BehaviorPrenatal Nutritional Physiological PhenomenaApneaAnalysis of VarianceOxytocinSocial IsolationAge FactorsDietDiet, Protein-RestrictedEatingSex CharacteristicsMilk SubstitutesParvovirus, CanineDose-Response Relationship, DrugNesting BehaviorRandom AllocationParturitionAvoidance LearningFood DeprivationSocial BehaviorMice, Inbred StrainsSmellPregnancy ComplicationsCritical Period (Psychology)Imprinting (Psychology)Herpesvirus 1, CanidFetal ResorptionEnterocolitis, NecrotizingPinnipediaOvernutritionAggressionLaboratory Animal ScienceFetal ViabilityBreedingRNA, MessengerEmbryonic and Fetal DevelopmentAnoxiaProlactinMice, KnockoutEthanolDogsGestational AgeHousing, AnimalParvoviridae InfectionsPostpartum PeriodDiet, Fat-Restricted