Litter SizeBreedingReproductionWeaningOvulationSwineLactationPregnancyFertilityBody WeightPregnancy, AnimalParityAnimals, SucklingHybrid VigorSelection, GeneticSheepBirth WeightAnimals, NewbornAnimal HusbandrySex RatioCrosses, GeneticLeast-Squares AnalysisFetal DeathFetal ViabilityUterusWeight GainAnimal Nutritional Physiological PhenomenaOrgan SizeEstrusMilkEmbryonic and Fetal DevelopmentModels, GeneticAnimal Population GroupsEatingSexual MaturationArvicolinaeInbreedingSus scrofaQuantitative Trait, HeritableFetal ResorptionRandom AllocationInsemination, ArtificialPhenotypeCarnivoryAnimal FeedHousing, AnimalScrotumOvernutritionDicambaTrenbolone AcetateFetusVaccines, ContraceptiveParturitionStillbirthEmbryo ImplantationViviparity, NonmammalianBody CompositionSeasonsEstrus DetectionPlacentaFetal DevelopmentGenotypeQuadrupletsOvaryMaternal BehaviorTime FactorsAdipose TissueOvulation Inhibition