Item Control (D1) Levels of treated broad bean hulls (%) 25 (D2) 50 (D3) 75 (D4) 100(D5) DM (%) 91.20 92.14 92.54 92.67 92.95 OM (%) 93.16 93.26 93.42 93.13 92.90 CP (%) 30.11 30.87 31.42 31.93 31.98 EE (%) 8.87 8.54 8.44 8.79 9.13 CF (%) 5.68 5.98 6.27 6.88 7.12 Ash (%) 6.54 6.74 6.58 6.87 7.10 NFE (%) 48.80 47.87 47.29 45.53 44.67 GE (Kcal/g)* 4.59 4.57 4.57 4.56 4.50

*GE (Gross energy) was calculated according to NRC (1993) by using factors of 5.65, 9.45 and 4.22 K cal per gram of protein, lipid and carbohydrate, respectively. Table 3: Proximate chemical analysis (%) of the experimental diets used in the experiment.