Changes in the Testes and Epididymides of Rabbits Following Long Term Vasectomy or Vasocystostomy: Correlation with Results of Vasovasostomy

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Abstract
The effect of vasectomy (sperm obstruction) with vasocystostomy (sperm diversion) on the testes and epididymides of rabbits was compared and pathologic changes with success or failure of vasovasostomy to restore fertility were correlated. Vasovasostomy restored fertility to 36% of rabbits following vasectomy and to 100% of those in which sperm was previously diverted by vasocystostomy. Pathologic changes were found in 73% of testes and 42% of epididymides following sperm obstruction, but there were no changes in the testis and only rare changes in the epididymis following sperm diversion. Vasocystostomy is evidently a more physiological form of surgical contraception than conventional vasectomy in the rabbit.