Melatonin: Antigonadal and progonadal effects in male golden hamsters

摘要: Melatonin induced marked testicular regression in hamsters maintained on photostimulatory long days (light-dark 14 : 10). In animals nonstimulatory short 6 18), small amounts of melatonin (50 micrograms per day; 100 millimeters capsule length) prevented regression; but atrophy occurred that received larger (75 to 150 200 and control none. The results demonstrate can exert either pro- or antigonadal effects emphasize the testis cannot be properly assessed unless account is taken dosage mode administration photoperiod which experimental are maintained.