A feeding trial was conducted to determine the effect of dietary supplementation with either a-tocopherol acetate (vitamin E) or oregano extract on the production performance of broilers. Broilers were fed diets supplemented with either 100, 150 and 200 ppm vitamin E or 100, 200 and 300 ppm: oregano under two supplementation periods: starter to finisher (8-42 days) and finisher (29-42 days) stages. Dietary supplementation with either vitamin E or oregano extract did not significantly affect live weight gain, livability and dressing percentage regardless of the period of supplementation. However, feed consumption was significantly affected by dietary supplementation in both periods. Significant differences in feed efficiency were observed among treatments during the starter to finisher supplementation period. Feed efficiency of broilers fed the control and supplemented diets during the finisher stage only were not significantly different. Income over feed and chick cost (IOFCC) was lower in broilers fed diets supplemented with either vitamin E or oregano extract during the starter to finisher stage. Higher IOFCC was obtained from broilers fed diets supplemented with oregano extract during the finisher stage than those fed the control and the vitamin E supplemented diets.