This study conducted to investigate the effects of Potassium Dichromate (K2Cr2O7) and Turmeric Oil (TO) on reproductive efficiency of adult male rats. Twenty four male rats aged 100 days divided randomly into 4 groups. G1 received 1 ml of dimethyle sulfoxide (DMSO) 5% orally as control, G2 received K2Cr2O7 (24 mg/kg orally), G3 received TO dissolve in DMSO 5% (8.5 mg/kg orally) and G4 received ...