BreedingHorsesArterivirus InfectionsHorse DiseasesArteritis Virus, EquineSemenSemen PreservationSeasonsReproductionSpermatozoaSperm MotilityFertilitySperm HeadSexual Behavior, AnimalEquidaeLibidoEndometritisHerpesvirus 3, EquidTestisEjaculationSperm CapacitationSperm CountSulpiridePeriodicityInsemination, ArtificialTaylorella equigenitalisTestosteroneSocial DominanceSeminal Plasma ProteinsAcrosome ReactionAnimal MigrationNandroloneCattleLuteinizing HormoneSemen AnalysisNesting BehaviorChlortetracyclineBirdsGenetic VariationSheepProtaminesSpermatogenesisCharadriiformesProlactinSongbirdsAnimal HusbandryPeanut AgglutininInbreedingColicFollicle Stimulating HormoneCarrier StateCryopreservationAnimal FeedPasseriformesSelection, GeneticSertoli CellsCrops, AgriculturalCrosses, GeneticPregnancyPolyvinyl AlcoholQuantitative Trait LociEpididymisAnabolic AgentsCentrifugationQuantitative Trait, HeritableLeydig CellsLitter SizeGenetic MarkersSpecies SpecificitySperm-Ovum InteractionsModels, GeneticDNA ShufflingHelping BehaviorMicrosatellite RepeatsPopulation DynamicsGenome, PlantHydrocortisoneEcosystemSpheniscidaePopulation DensityGenotypeEnvironmentPhysical Conditioning, AnimalSparrowsAnimal Nutritional Physiological PhenomenaClutch SizeWeaningFalconiformesTime FactorsZona PellucidaThyrotropin-Releasing HormonePhenotypeFeathersPhysical ExertionPhylogenySpermatocytesAnalysis of VarianceGonadotropin-Releasing HormoneMolecular Sequence DataDisease Resistance