Fig. 4

Cecal butyrate levels are reduced in florfenicol-treated chickens. A Alterations in cecal metabolites were identified in a principal component analysis (n = 3 per group) using the same scheme as in Fig. 1. B–D The relative peak area (left panel) and the concentration (right panel) of butyrate, acetate, and propionate as determined using NMR and HPLC. FFC, florfenicol. Results are presented as the mean ± SEM. Statistical differences were determined in a t-test; *P < 0.05