TestisSperm CountSperm HeadSperm CapacitationRete TestisSperm MaturationSpermatogenesisEpididymisInfertility, MaleSperm TransportSertoli CellsSperm-Ovum InteractionsAcrosomeSperm Injections, IntracytoplasmicFertilizationSemenCryptorchidismSperm MidpieceSperm BanksLeydig CellsSemen PreservationFertilitySemen AnalysisZona PellucidaSpermatidsEjaculationSpermatozoaOligospermiaTesticular DiseasesSpermatogoniaTestosteroneCryopreservationGenitalia, MaleSeminiferous EpitheliumSperm WhaleTesticular NeoplasmsSpermatocytesProtaminesSeminal Plasma ProteinsOrgan SizeOvumMolecular Sequence DataAzoospermiaScrotumGerm CellsAsthenozoospermiaSexual MaturationReproductionVasectomyOrchitisInsemination, ArtificialAmino Acid SequenceSea UrchinsRNA, MessengerOocytesSeminal VesiclesSpermatic Cord TorsionPregnancySexual Behavior, AnimalBase SequenceEgg ProteinsY ChromosomeImmunohistochemistryFollicle Stimulating HormoneTissue DistributionMeiosisContraceptive Agents, MaleOrgan SpecificitySex DifferentiationSeminal Vesicle Secretory ProteinsBlood-Testis BarrierOvaryOrchiectomySex Determination ProcessesFallopian TubesDNA, ComplementaryCattleCopulationInseminationReverse Transcriptase Polymerase Chain ReactionCryoprotective AgentsGonadsLuteinizing HormoneSwineRats, Sprague-DawleySex-Determining Region Y ProteinWhalesIn Situ HybridizationGene Expression Regulation, DevelopmentalCloning, MolecularMicroinjectionsVas DeferensMicroscopy, ElectronDNA FragmentationInhibinsPregnancy RateDibutyl PhthalateGene ExpressionTesticular HormonesTime Factors