To evaluate the digestibility of several fiber measures, three replicates of eight broilers of four-weeks age and three replicates of six broilers of five-weeks age, deriving from three Ross broilers lots, logged in metabolic cages and on four daily time-restricted 35 min feeding were used. Two diets were used, normal and fibrous, with similar nutrients to energy ratios, based on corn, wheat, soybean meal and its fibrous by-products. Block randomized design was adopted. The fibrous diet, with two times more fibre, resulted in smaller energy and protein utilization (P<0,02). Crude fiber and neutral detergent fiber presented do not trustful digestibility coefficients (DC), with high variation coefficients (218 and 56%, resp.) and negative values. The DC was high and different between diets for the total dietary fiber (32 vs. 18%, P<0,01) and neutral detergent fiber (25 vs. 21%, P<0,07). The water insoluble cell wall CD was small, without difference between diets (14 vs. 13%, P>0,66), and this measure was considered the best to express the dietary fiber for broilers.