Litter SizeTestisSpermatogenesisReproductionSperm CountHornsOrgan SizeSertoli CellsFertilityPaternitySpermatozoaScrotumBreedingBody WeightTestosteroneSeminiferous TubulesSexual Behavior, AnimalSwineWeaningPregnancyOvulationLactationSemenSeasonsPregnancy, AnimalFollicle Stimulating HormoneLuteinizing HormoneParityPhotoperiodAnimals, SucklingRete TestisHybrid VigorSelection, GeneticSheepAnimals, NewbornBirth WeightAnimal HusbandrySex RatioSexual MaturationCrosses, GeneticFetal DeathUterusLeast-Squares AnalysisFetal ViabilityCryptorchidismWeight GainEmbryonic and Fetal DevelopmentEstrusAnimal Nutritional Physiological PhenomenaMilkModels, GeneticAnimal Population GroupsArvicolinaeLeydig CellsEatingSus scrofaEpididymisInbreedingRandom AllocationInsemination, ArtificialFetal ResorptionQuantitative Trait, HeritableOvarySpermatidsFetusCarnivoryAnimal FeedPhenotypeHousing, AnimalSpermatogoniaOvernutritionDicambaVaccines, ContraceptiveTrenbolone AcetateParturitionStillbirthEmbryo ImplantationViviparity, NonmammalianSeminal VesiclesFetal DevelopmentBody CompositionSeminiferous EpitheliumEstrus DetectionPlacentaMice, Inbred StrainsTesticular DiseasesSpermatocytesQuadrupletsMaternal-Fetal ExchangeAdipose TissueGonadotropins, EquineFetal WeightOvulation InhibitionGenotypeMaternal Behavior