IcelandEnvironmentGene-Environment InteractionGenetic Predisposition to DiseaseGenotypeRisk FactorsBreedingPanicumQuantitative Trait, HeritableWeaningTwin Studies as TopicModels, GeneticGenetic PleiotropySocial EnvironmentHybrid VigorQuantitative Trait LociPhenotypeAnimal HusbandryCrosses, GeneticReceptors, Dopamine D4Behavior, AnimalPoaceaeDiseases in TwinsSelection, GeneticSerotonin Plasma Membrane Transport ProteinsEpistasis, GeneticCattleGenetic VariationTwinsBody WeightFeeding BehaviorAllelesAnalysis of VarianceTriticumChromosome MappingRegression AnalysisSeasonsPolymorphism, Single NucleotideLife Change EventsModels, StatisticalReproductionSocial BehaviorLinear ModelsAnimal FeedHealth BehaviorModels, BiologicalPolymorphism, GeneticBehaviorGenetic MarkersSexual BehaviorSexual Behavior, AnimalExploratory BehaviorChild BehaviorAdolescent BehaviorMaternal BehaviorChild Behavior DisordersEnvironment Design