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In this microscopic study, the toxic effects of cadmium (Cd) and the protective role of a zinc (Zn) co-treatment were investigated in the testes of the rats treated with Cd. At the dose and duration used, Cd severely damaged the seminiferous tubules and caused the degeneration and disintegration of spermatogenic cells. Leydig cells were also lost after Cd treatment. The present study showed that zinc co-treatment protected testes against toxic effects of cadmium.