HorsesArterivirus InfectionsHorse DiseasesArteritis Virus, EquineSemenSemen PreservationSpermatozoaSperm MotilitySperm HeadEquidaeFertilityLibidoHerpesvirus 3, EquidEndometritisSperm CapacitationSulpirideEjaculationSperm CountTestisTaylorella equigenitalisSeasonsSeminal Plasma ProteinsAcrosome ReactionNandrolonePeriodicitySexual Behavior, AnimalTestosteroneSemen AnalysisProtaminesBreedingChlortetracyclineInsemination, ArtificialPeanut AgglutininColicSpermatogenesisProlactinSocial DominanceCarrier StateLuteinizing HormoneCryopreservationPolyvinyl AlcoholSertoli CellsAnabolic AgentsCentrifugationFollicle Stimulating HormoneSperm-Ovum InteractionsLeydig CellsEpididymisZona PellucidaReproductionThyrotropin-Releasing HormoneHydrocortisoneAnimal FeedPhysical ExertionPhysical Conditioning, AnimalSex AttractantsSpermatocytesCattle3-Hydroxysteroid DehydrogenasesPituitary Gland, AnteriorHormonesFertilization in VitroCell CountAnimal Nutritional Physiological PhenomenaSheepMolecular Sequence DataInfertility, MalePregnancy RateGonadotropin-Releasing HormoneOrgan SizeAmino Acid SequenceTime FactorsLightSpecies SpecificityAnalysis of VarianceGenetic VariationPregnancyRadioimmunoassayOocytesStress, PhysiologicalDisease OutbreaksRandom AllocationFlow CytometryPhylogenyPhosphorylation