Fig. 2

Effects of vaccine overdose and C. perfringens (CP) challenge on diarrhea score for 9 d in broilers (Exp. 1). 0, non-vaccine challenge; × 10, oral administration the levels of × 10 recommended dose of vaccine; × 20, oral administration the levels of × 20 recommended dose of vaccines; No, non-oral challenged with CP; Yes, oral challenged with 3 mL of 2.2 × 10⁷ CFU CP. n = 5 pen/treatment. χ² = 173.283, P < 0.001. Numbers inside the bar indicates percentatge of score out of total (100%) as shown in legned. ^a,b,cMeans scores followed by different superscript in the bar graph indicates statistical significant by the Student’s test (P < 0.05)