The BW, ADG, and F:G ratio between groups Ⅴ and Ⅵ did not have significantly vary (P > 0.05). The level of pantothenic acid was greater than 30 mg/kg, and the BW, ADG, and F:G ratio did not significantly vary (P > 0.05).
The ADFI and mortality rate did not significantly differ among groups (P > 0.05). Therefore, conic fitting was conducted using the BW, ADG, and F:G ratio and the levels of dietary pantothenic acid in groups Ⅰ to Ⅳ. The regression equations were as follows: