الفهرس 
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Abstract
This work was conducted to study the effect of addition of some feed additives on productive efficiency parameters (growth performance and carcass traits), economic efficiency parameters (costs, returns, net profit and collective and partial measures of efficiency), immunological response to Newcastle virus vaccine and some biochemical and hematological characters in broilers production.
A total number of 576 unsexed one day old chicks of Cobb breed and Ross breed were used in this experiment. The chicks of each breed were randomly divided into 6 equal groups (48 bird/group), then each group divided into 3 replicates (16 bird/replicate).
The broiler chicks of group 1 for both breeds were fed on the basal diet without supplementation (control group). Broiler chicks of group 2 for both breeds were fed on basal diet supplemented with probiotic Baymix® GrobigTM (0.1g/kg diet). Broiler chicks of group 3 for both breeds were fed on basal diet supplemented with prebiotic Cel-Max dryTM (0.5g/kg diet). Broiler chicks of group 4 for both breeds were fed on basal diet supplemented with symbiotic (prebiotic Cel-Max dryTM (0.5g/kg diet) and probiotic Baymix® GrobigTM (0.1g/kg diet). Broiler chicks of group 5 for both breeds were fed on basal diet supplemented with organic acid Fylax® plus (1 g/kg diet). Broiler chicks of group 6 for both breeds were fed on enzyme supplemented diet Allzyme® SSF (0.2g/kg diet).
We studied the variables that affecting productive efficiency which include body weight, body weight gain, relative growth rate, feed consumption, feed conversion ratio, weight and relative weight (live weight, weight after slaughter, weight of different organs (liver, intestine, gizzard, heart, gizzard fat and abdominal fat and lymphoid organ) and dressing percentage, and immunological response against Newcastle virus vaccine, some hematological parameters of blood through determination complete blood cells and differential leucocytic counts (Lymphocyte, Neutrophil, Monocyte, Basophil, Esinophil), biochemical parameters of serum ( albumin, globulin, total protein and albumin / globulin ratio) , also determination of economic efficiency parameters through determination of total returns, total costs, net profit, collective and partial measures of efficiency.