The effects of vasectomy on spermatogenesis in the dog, Canis Familaris: a meiotic analysis.

It was observed (1) that reversible meiotic changes did in fact take place following vasectomy, as evidenced by the changing profile of the various stages of meiosis, resulting in a spermatogenic arrest accompanied by a drop in the frequency of mature spermatids and depletion of spermiocytes. (2) By 15 weeks postvasectomy, repair had progressed from the earlier meiotic stages, with a return to the normal, control, meiotic distribution. (3) The time from the observation of degenerative changes to the restoration of control values, according to our data, was approximately 100 days.