Crosses, GeneticMice, Inbred StrainsQuantitative Trait LociBreedingReproductionSeasonsRed CrossSexual Behavior, AnimalAnimal MigrationNesting BehaviorBirdsInbreedingCharadriiformesAnimal HusbandrySongbirdsGenetic MarkersQuantitative Trait, HeritableSelection, GeneticFertilityCrops, AgriculturalPasseriformesGenetic VariationModels, GeneticLitter SizeCattleGenotypeMicrosatellite RepeatsPhenotypeSheepHybridization, GeneticGenome, PlantChromosome MappingDNA ShufflingHelping BehaviorPopulation DynamicsEcosystemEnvironment