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Epididymal function in the vasectomized rabbit.

24 adult male rabbits were bilaterally vasectomized to investigate the effects on the function of the epididymis by examining the chemical composition of the luminal plasma. The luminal contents were collected from the cauda epididymidis after 2 6 12 and 24 weeks by cannulation and analyses were made for electrolytes protein glycerylphosphorylcholine inorganic phosphate osmotic pressure pH and enzymes. There was distention of the cauda epididymidis by 6 weeks but the chemical composition of the luminal plasma was similar in all experiment groups. Lactic dehydrogenase (LDH) activity rose from 648 IU in the control to 691 at 2 weeks 4867 at 6 weeks 1437 at 12 weeks and 3386 at 24 weeks. At 6 and 24 weeks after vasectomy all spermatozoa from the ductus deferens stained with eosin and 60-70% were decapitate whereas from the proximal cauda epididymidis only 8% and 26% respectively were eosinophilic and less than 18% were decapitate. Results indicated a correlation between LDH activity and oesinophilic spermatozoa incidence. It was suggested that vasectomy does not seriously impair the capacity of the cauda epididymidis to maintain a stable "milieu" in the lumen of the duct.