The level of fat oxidation had no influence (P > 0.05) on the rate of feed conversion (Table3). These results corroborate those reported by Jankowski et al. [27]. Poultry performance differed (P < 0.05) according to the vitamin E level
fed. Birds fed 800 mg of vitamin E/kg of diet had the poorest feed conversion when compared with birds that received 65 mg of vitamin E/kg of diet. No significant interaction (P > 0.05) between fat oxidation levels and vitamin E supplementation was observed for feed conversion.These results are similar to those reported by Racanicci et al. [8], in which broiler chickens were fed either nonoxidized or oxidized oil at 4% inclusion in the diets. The addition of oxidized
oil to bird diets had no effect on growth. Moreover, Engberg et al. [7] evaluated the addition of 11% fresh vegetable oil (1 mEq of peroxide/kg) and oxidized vegetable oil (156 mEq of peroxide/kg) in the diets of broiler chickens fed for a period of 4 wk. They found no differences in feed intake and FCR between the groups fed these diets.