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In 56 males, vasectomized 8 years previously, and in 56 age-matched non-vasectomized controls, a number of secretory products of prostatic, seminal vesicular and epididymal/testicular origin were used to monitor post-operative changes in accessory sex gland function. Significant reductions were observed in seminal plasma volume (3.0 vs 4.9 ml, P less than 0.01), and the total ejaculate contents of zinc (5.1 vs 9.7 mumol, P less than 0.01), magnesium (10.6 vs 26.5 mumol, P less than 0.01), PAP (371 vs 1260 IU, P less than 0.005) and citric acid (76.7 vs 127.9 mumol, P less than 0.05), indicating a major impact on secretions of prostatic origin. Unaltered PGE-1 (54.3 vs 53.2 micrograms, P less than 0.95) and fructose (3.9 vs 4.5 mumol, P greater than 0.1) indicated no effects on the secretory function of the seminal vesicles. A marked reduction was demonstrated in the ejaculatory contents of the polyamines, spermidine (366 vs 650 nmol, P less than 0.005) and spermine (5435 vs 11 804 nmol, P less than 0.05) but not their acknowledged precursor, putrescine, which is also of prostatic origin.

Polyamines and other accessory sex gland secretions in human seminal plasma 8 years after vasectomy