Fig. 1

Effect of the ABX protocol on the performance and total bacterial content in the cecum of broilers from 1 to 21 d. A The changes in body weight of broilers from 1 to 21 d. B Average daily gain. C Average daily feed intake. D Feed conversion ratio. E The changes in the rectal temperature of broilers from 1 to 21 d (n = 32). F The abundance of total bacteria in cecal contents of broilers at 21 days of age (n = 8). Data are expressed as the mean ± SEM. ^*P < 0.05, ^**P < 0.01, ^***P < 0.001