HorsesArterivirus InfectionsHorse DiseasesArteritis Virus, EquineSemenSemen PreservationSpermatozoaSperm MotilitySperm HeadEquidaeFertilityLibidoHerpesvirus 3, EquidUrinary Tract InfectionsEndometritisSperm CapacitationSulpirideEjaculationSperm CountTestisSeasonsGastrointestinal TractTaylorella equigenitalisUrinary TractSeminal Plasma ProteinsAcrosome ReactionNandrolonePeriodicitySexual Behavior, AnimalTestosteroneRespiratory Tract InfectionsSemen AnalysisPyramidal TractsBreedingProtaminesInsemination, ArtificialChlortetracyclinePeanut AgglutininColicSpermatogenesisCarrier StateProlactinSocial DominanceCryopreservationLuteinizing HormonePolyvinyl AlcoholSertoli CellsEpididymisCentrifugationAnabolic AgentsFollicle Stimulating HormoneSperm-Ovum InteractionsLeydig CellsAnimal FeedReproductionZona PellucidaThyrotropin-Releasing HormoneHydrocortisoneCattlePhysical ExertionPhysical Conditioning, AnimalDigestive SystemGenitalia, FemaleMolecular Sequence DataSex AttractantsSpermatocytes3-Hydroxysteroid DehydrogenasesPituitary Gland, AnteriorCell CountHormonesTime FactorsAnimal Nutritional Physiological PhenomenaSheepFertilization in VitroAmino Acid SequenceReproductive Tract InfectionsOrgan SizePregnancySpecies SpecificityInfertility, MaleBiliary TractRespiratory SystemAnalysis of VariancePregnancy RateGonadotropin-Releasing HormoneBiliary Tract DiseasesGenetic VariationLightRandom AllocationRadioimmunoassayPhylogenyOocytesDigestive System Physiological PhenomenaDisease OutbreaksStress, PhysiologicalUrologic DiseasesUrogenital SystemUpper Gastrointestinal TractFlow CytometryVagina