Four healthy donors provided three ejaculates on one day to deplete their sperm reserves and also after abstention periods of 1, 2, 4, 7, 10 and 14 days. The percentage of spermatozoa that were normally formed, progressively motile and which swelled in hypotonic medium remained unchanged throughout this period and the increase in total numbers of viable spermatozoa for 10 days prompted a comparison of seven donors and six oligozoospermic men. Multiple ejaculations after 10 days of abstinence for the patients with low normal, motile sperm numbers increased the total number, number of normal and number of motile spermatozoa by a mean of 230, 370 and 520%, respectively.

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