Results of this study showed that dietary OL of 30 g /kg and above reduced performance (body weight gain and feed efficiency) during the starter phase and OL of 50 g /kg reduced performance during the finisher phase and eviscerated carcass weight at 35 days of age. However, feed intake was not influenced by dietary level of OL during any of the experimental periods. The significant reduction in the performance of birds during the starter phase may suggest that birds cannot tolerate dietary level of 30 g OL/kg diet at younger age. Whilst the non-significant effect of the same dietary level of OL on the performance of birds during the finisher phase may suggest an improvement in their ability to utilize OL at older age. The lower body weight gain of birds fed dietary OL levels of 30 g /kg at 35 days of age indicated carry over effects from the starter phase period. The reduction in body weight gain and feed efficiency associated with feeding higher level of OL in the diet may be attributed to the higher fiber content of OL