DiscussionDietary peppermint had no significant effect on FI, BW gain, and FCR at all stages. This result was in line with others(Hernandez et al., 2004; Ocak et al., 2008; Toghyani et al., 2010). However, considering the entire experimental period, anincreasing trend for FI was observed in birds received dietary peppermint. This response to incremental levels of peppermintmay support this hypothesis that as the birds aged the taste buds may developed and adult birds have twice the number