A total of 245 male Cobb broilers (10 to 18 d old) were used to determine the total-tract nutrient digestibility (TTND) of dry matter (DM), mineral matter (MM), metabolizable energy (ME), nitrogen retention (NR), calcium (Ca), phosphorus (P) and neutral detergent fiber (NDF) of rice bran (RB), with or without multi-carbohydrase (Carb) and phytase (Phy) enzyme supplementation. The birds were allotted in a completely randomized design with 5 treatments and 7 replications (7 birds per replication). The experimental period was 8 d, 5 d of adaptation and 3 d of total feces collection. The treatments were: Control diet (CD); CD + 30% of RB; CD + 30% of RB + 200 mg/kg of Carb (RB+Carb); CD + 30% of RB + 50 mg/kg of Phy (RB+Phy); CD + 30% of RB + Carb + Phy (RB+Carb+Phy). CD was used only to calculate the digestibility of the RB. The diets were formulated to meet or exceed the nutrient requirements (Rostagno et al., 2011) for broiler chickens. The TTND coefficients of RB are presented in Table 1. Alone or combined, Carb and Phy improved (P < 0.05) the TTND of RB. These results are associated with enzymatic activity to enhance nutrient digestibility, focusing primarily on removing the antinutritive effects of nonstarch polysaccharides (NSP), such as arabinoxylans and β-glucans from broiler diets based on viscous grains. In general, enzymes improved the TTND of RB for young broiler chickens. Table 1. Apparent digestibility coefficients and metabolizable energy of rice bran for broiler chickens

Item	DM (%)	MM (%)	ME(kcal·kg−1)	NR (%)	Ca (%)	P (%)	NDF (%)
Diet
RB	66.42	75.38	3765	62.04	49.31	69.60	68.09
RB + Carb	69.82	80.59	3916	66.42	56.64	74.11	74.80
RB + Phy	70.36	75.85	3999	70.25	58.34	71.11	74.59
RB + Carb + Phy	75.07	78.14	4252	70.07	57.76	74.88	68.61
SD by Diet	1.74	2.25	53.52	2.28	3.94	1.88	2.76
P-values for contrasts1
C1	<0.001	0.009	<0.001	<0.001	<0.001	<0.001	<0.001
C2	<0.001	0.939	<0.001	0.117	0.886	0.016	<0.001
C3	0.582	<0.001	0.007	0.005	0.432	0.007	0.892

¹C1 = RB vs. RB + Carb; RB + Phy; RB + Carb + Phy; C2 = RB + Carb; RB + Phy vs. RB + Carb + Phy; C3 = RB + Carb vs. RB + Phy.