APEC load in ceca of chickens (at 7 dpi [days postinfection]) treated with peptides at 50-mg/kg body weight (A) and 100-mg/kg body weight (B) doses and body weights of chickens treated with peptides at 50-mg/kg body weight (C) and 100-mg/kg body weight (D) doses. *, P < 0.05; **, P < 0.01; ***, P < 0.001, Tukey’s test; PC, infected but not treated chickens; NC, noninfected and nontreated chickens.