الفهرس 
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Abstract
The present study was conducted at the poultry Farm; Agricultural Researches and Experiments Station; Faculty of Agriculture, Mansoura University during the period from January to February from 2002. The reasons for undertaken this study was to investigate the possibility of including 15, 20 and 25% of rice bran or wheat bran or mix of rice bran and wheat bran in broiler diets containing 19 % Cp and 3100 kcal/kg, diet without or with mix of phytase and Avizyme supplementation. A total number of 480 unsexed broiler Hubbard chicks were randomly chosen from the original 550 chicks at 15 day old, at chicks were fed a commercial starter diet contained 22.5 % crude protein and 3150 Kcal ME / Kg diet during the per experimental period from 1 to 14 of age . Then there were wing banding and individually weighed to the nearest, g after being fasted for 12 hr, and randomly to 20 treatments of four replicates containing 6 chicks each. Thus, initial live body weight among replicates as well as treatments was nearly similar. The chicks were raised during the brooding and growing period in batteries with floor decks, placed in a naturally ventilated rearing room, provided with continuous florescent illumination with free access to feed and water. The results obtained can be summarized in the followings 1. there were no significant differences were detected among groups fed diet contained 0.0, 15, and 20% rice bran or wheat bran and combination of rice bran and wheat bran. 2. There were no significant differences between groups fed diet with or without enzyme supplementation on live body weight, weight gain, feed consumption and feed conversion of broiler chicks. 3. The results showed that no effect of rice bran levels on absolute weight of eviscerated carcass, visceral organs (giblets), total edible parts and abdominal fat. 4. The results showed that no effect of wheat bran levels on relative weights of heart, liver, and giblets whereas, with some exception such as relative weights of gizzard and abdominal fat ratio. 5. There were no significant effects of mix adding enzyme on concentration of blood glucose, plasma total protein, albumen and ALT. While there were significant effect of mix adding enzyme on concentration of cholesterol. 6. No significant differences were detected among groups of chicks fed diets contained wheat bran and rice bran combination on concentration of blood phosphors, blood calcium, and plasma total lipid and AST, while those in plasma triglycerides were significant. 7. The best economic efficiency was recorded by group of broiler chicks fed diet contained control diet followed by diets contained 15 and 20% rice bran or enzyme supplementation diets with no significant 8. The results indicate that wheat bran and rice bran combination at 15% or control diet proved to be suitable and economic for broiler chicks. 9. Results sowed that the wheat bran at 15 or 20 % or control diets proved to be suitable and economic for broiler chicks.