Thirty crossbred barrows were used to evaluate the effects of conventional and mitochondrially targeted antioxidants on body weight, average daily gain, feed efficiency, and lean tissue accretion. The study did not yield statistically significant results for any variable measured. However, for each variable measured, the ranking of responses for treatments matched what was predicted by the hypothesis. Our results suggest that use of mitochondrially targeted antioxidants show promise in improving feed efficiency