TwinsDiseases in TwinsFetal DeathTwins, MonozygoticStillbirthTwins, ConjoinedTwins, DizygoticAbortion, VeterinaryPregnancyAnencephalyLitter SizeTwin Studies as TopicArthrogryposisParturitionAborted FetusInfant, NewbornPlacenta DiseasesPregnancy, TwinSwineSwine DiseasesDiaphragmatic EventrationFetal DiseasesAbnormalities, MultipleHorse DiseasesGestational AgePregnancy OutcomeCongenital AbnormalitiesNeural Tube DefectsCattle DiseasesBirth WeightLeptospira interrogansReproductionAnimals, NewbornInfant MortalitySheep DiseasesPregnancy Complications, InfectiousParityFetusPrenatal DiagnosisWeaningPregnancy, MultipleBreedingHorsesPregnancy ComplicationsCattleFetofetal TransfusionTripletsPregnancy Reduction, MultifetalEnvironmentChorionGenetics, BehavioralUltrasonography, PrenatalGene-Environment InteractionTwinning, MonozygoticSocial EnvironmentRegistriesFetoscopyQuadrupletsPolyhydramniosDenmarkDermatoglyphicsGenetic Predisposition to DiseaseReproductive Techniques, AssistedPhenotypeTwin StudySwedenBirth Order