Dietary Fiber Level Improve Growth Performance, Nutrient Digestibility, Immune and Intestinal Morphology of Broilers from Day 22 to 42

< 0.05). The quadratic regression analysis showed that the optimum dietary CF level was 7-9%. In conclusion, under the conditions of this experiment, a diet of 7-9% CF may promote growth performance by improving the nutrient digestibility, immunity and intestinal morphology of broilers from day 22 to 42.