Human sperm cryopreservation is widely used in many assisted conception units to preserve male fertility. The conventional sperm cryopreservation techniques are not appropriate for samples obtained from severe oligozoospermic or obstructive azoospermic patients because the spermatozoa are diluted and lost during centrifugation. The aim of this study was to investigate the efficacy of emptied sheep's ovarian follicles as a container for the cryopreservation of human spermatozoa to preserve the presence of low concentrations of the cryopreserved spermatozoa post-thawing. The study was carried...