الفهرس 
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Abstract
The experiment was conducted at (January – February 2012) at the experimental house of the Faculty of Veterinary Medicine, University of Sadat City, Egypt. Three hundreds, one–day–old, unsexed commercial broiler chicks (Cobb) were assigned into 6 groups, each of 50 chicks and reared under the same conditions. Each group treated as follows: Group1(control negative): Chicks fed only basic diet . without supplementation of probiotics and/or bioflavonoid (Bio-Guard).
Group2: Chicks fed basic diet with supplementation of Bio-Guard (as bioflavonoid and antioxidant in drinking water). Group3: Chicks fed basic diet with Anta®Pro EF (as probiotics in drinking water).
Group4: Chicks fed basic diet with Anta®Pro EF and Bio-Guard (in drinking water). Group5: Chicks fed basic diet mixed with Super-CyC (as probiotic).
Group6:Chicks fed basic diet mixed with Super-CyC and Bio-Guard (in drinking water ). On days 21 and 42, broiler growth performance (BW,BWG,&FCR), CRT weight, hemogram (Hb,PCV&MCHC%),carcass quality and SOD activity were estimated . Results obtained showed that probiotics and/or bioflavonoids supplemented groups (G3 : G6) improved significantly (P<0.05) in the growth performance(BW,BWG,&FCR) and CRT weight at 42 days of age relative to control groups (G1and G2).
Generally, the growth performance and carcass quality parameters of the tested birds were not recorded significant differences during (0-21 days) of the experiment period.
The levels of superoxide were significantly increased (P<0.05) in all treated group (group 2, 3 ,4 ,5 and 6) in comparison to normal control (1) at 21st and 42nd day of age. The more prominent significantly increased (P<0.05) were shown in G4 and G6 (combination of Bio-Guard and Super-CyC) at 21 and 42 days old.