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Seasonal changes in histophysiology of testis & epididymis of the Indian gerbil Tatera indica hardwickei (Gray).

Every mo during a yr, steroid dehydrogenases were localized histochem. in testis and epididymis of the gerbil T. indica hardwickei (Gray). Activities of I�5-3I²- and 17-hyroxysteroid dehydrogenases and NADH diaphorase were intense in the interstitium of the testis but seminiferous epithelium also showed pos. result. In epididymis, the epithelium and luminal contents (spermatozoa) showed enzyme activity, but it was more so in cauda than in caput and corpus epididymis. There does not seem to be any substrate specificity for hydroxysteroid dehydrogenases with any of the substrates studied. The study indicates marked redn. in steroidogenic activity in Apr. and May. The peak was seen twice a yr, one in June-July and the other in Dec.-Jan. During rest of the yr there is a moderate activity. These observations correlate with seasonal changes in wt. and histol. of these organs. [on SciFinder(R)]