Litter SizeBreedingReproductionWeaningOvulationLactationSwinePregnancyFertilityBody WeightPregnancy, AnimalParityAnimals, SucklingHybrid VigorSelection, GeneticBirth WeightSheepAnimal HusbandryAnimals, NewbornSex RatioCrosses, GeneticLeast-Squares AnalysisFetal DeathFetal ViabilityUterusWeight GainAnimal Nutritional Physiological PhenomenaEstrusOrgan SizeMilkEmbryonic and Fetal DevelopmentModels, GeneticAnimal Population GroupsEatingSexual MaturationArvicolinaeInbreedingSus scrofaQuantitative Trait, HeritableFetal ResorptionInsemination, ArtificialRandom AllocationCarnivoryHousing, AnimalAnimal FeedScrotumOvernutritionDicambaPhenotypeTrenbolone AcetateVaccines, ContraceptiveParturitionFetusStillbirthEmbryo ImplantationViviparity, NonmammalianBody CompositionSeasonsEstrus DetectionPlacentaFetal DevelopmentQuadrupletsMaternal BehaviorOvulation Inhibition