الفهرس 
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Abstract
This study was conducted between April and November 2019 at the Poultry Research Center, Department of Poultry Production - Faculty of Agriculture - Alexandria University The chemical analysis were analyzed in the Animal Production Department Laboratories, and meat quality was analyzed in the Central Laboratory and Microbial Analysis at dairy Department Faculty of Agriculture - Alexandria University. Morphology was measured at Faculty of Veterinary Medicine, Alexandria University. Experiment was conducted using three hundred and sixty 308 Ross 1-d-old broiler chicks. . Chicks were randomly divided into three experimental groups 120 chicks each, with 3 replicates (40 birds/ pen) from 0 to 7days.Then subdivided into six groups of 60 chicks with 3 replicates (20 chicks each) from 8 to 18days. Then 12 groups of 30 chicks each 3 replicates (10 chicks each) from 19 to 33 days. In the pre starter phase (0–7 d) birds were fed pre -starter diet (ME; 2950 kcal/kg, CP; 24%), and during the starter phase (8 -18 d) they were fed with starter diet (ME; 3000 kcal/kg, CP; 22%). , and during the finisher phase (19–33 d) they were fed with finisher diet (ME; 3050 kcal/kg, CP; 20%). Diets were formulated to meet or exceed requirements suggested by the Ross guided 2018 during the entire trial33 days of age. The dietary additives of pre starter phase were consisted of: (i) basal diet without supplementation of additives (control); (ii) basal diet supplemented with 0.05% omega3 (iii) basal diet supplemented with 0.5% yeast. While starter phase diet supplemented with Lactobacillus acidophilus 1 ×1012 cfu/kg of feed. At Finisher phase diet were supplemented with 0.01% exogenous energy enzyme.