الفهرس 
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Abstract
Abstract
The experiment was carried out to evaluate the effect of adding dietary omega-3 fatty acids, enzymes, and vitamin B 6to broiler feed. One thousand and seven hundred fifty Arbor Acres chicks were divided into 7 equal groups starting from first day of age till five weeks. In the first control group (C) chicks were fed on basic diet without any additives and six treatment groups, three groups (T1, T2, T3) fed on basic diets containing 10% dietary omega-3 product, where one of them supplemented with vitamin B6 with no antibiotic (T2) and the other (T3) supplemented with enzymes during growing and finishing periods. Three groups (T4, T5, T6) fed on basic diets containing 5% dietary omega-3 product, where T5 supplemented with vitamin B6 (No antibiotic) and T6 supplemented with enzymes in feed during growing and finishing periods. The results obtained showed that live body weight, body weight gain, and feed conversion ratio showed significant improvement (P> 0.05) in all treated groups when compared to control one. There was a significant increase (P<0.05) of live body weight (g), Slaughter weight (g), and Dressing weight (g) in T3, T4, and T6 when compared with control group. A significant increase (P<0.05) of breast weight (g) in T3, T4, T5, and T6, A significant increase (P<0.05) of thigh weight (g) in T3. A significant increase (P<0.05) of drumstick weight (g) in T2, T4, T5, and T6. A significant decrease (P<0.05) of the abdominal fat weight (g) in T5, and T6. A significant decrease (P<0.05) of triglycerides (mg/dl) in T5, and T6. A significant decrease (P<0.05) of total cholesterol (mg/dl) in T3, T4, T5, and T6. A significant decrease (P<0.05) of LDL (mg/dl) in T3, T4, T5, and T6. A significant increase (P<0.05) of HDL (mg/dl) in T6. A significant increase (P<0.05) of total protein (g/dl) in T3, T5, and T6. A significant increase (P<0.05) of Albumin (g/dl) in T6. A significant increase (P<0.05) of Globulins (g/dl) in T3, T5. There was a significant improvement (P<0.05) in immune organs as thymus, bursa and spleen, phagocytic activity and antibody titer and growth hormone in most of treated groups. A significant increase (P<0.05) of villus length, villus width and crypt depth in treated groups compared to control one. Results revealed a significant decrease (P<0.05) of MDA and higher level of SOD compared to control group. It could be concluded that adding the dietary omega-3 fatty acids, enzymes, and vitamin B6 to broiler rations improved the efficacy of diets and had positive impact on the performance of broiler growth and carcass quality. The used doses of Dietary omega-3 %5 had a better effect than 10% for good growth and development of chicken meat, and to obtain high quality and safe products.
Keywords: Dietary omega 3 fatty acids, enzymes, vitamin B6. Broiler, performance.