Sperm MidpieceSpermatozoaSperm TailSperm MotilityAcrosomeSperm HeadSperm MaturationSpermatidsSea CucumbersEpididymisSperm CapacitationAcrosome ReactionInfertility, MaleSpermatogenesisTestisEjaculationSeminal Plasma ProteinsSperm-Ovum InteractionsFertilizationSperm CountSemenZona PellucidaFertilityFlagellaMicroscopy, ElectronMitochondriaCell MembraneMolecular Sequence DataMicroscopy, FluorescenceFluorescent Antibody TechniqueCattle