Significant reduction in sperm motility was observed in resveratrol-treated group. Sperm motility decreased from 92.55% _ 3.79% (control) to 20% _ 5.72%, P < 0.001; 8.5% _ 5.0%, P < 0.001 and 0.16% _ 0.29%, P < 0.001 after treatment with low, medium and high doses of resveratrol respectively (Fig. 1a). Thus, decrease in sperm motility was found to be dose dependent.