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