الفهرس 
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Abstract
This study was carried out in a broiler farm under the department supervision during the period from October to November 2020 to study Roselle leaves supplementation effects on growth, blood biochemical profiles and immune status of broiler chicks. The experimental designed was included: Control Basal diet without any addition T1 Basal diet plus 0.5% of Roselle leaves T2 Basal diet plus 1.0 % of Roselle leaves T3 Basal diet 1.5% of Roselle leaves Birds subjected to the same managerial and environmental conditions. The birds were grown in floor litter condition and subjected to 24 hrs, which extended to 5 weeks of age. Mash feed form and water were available ad labium throughout the experimental period. Three birds / replicate were weighed, slaughtered by slitting jugular vein of the birds in the morning, then after slaughter and complete bleeding scalded and defeathered. Carcasses chicks were eviscerated manually and weighed. Liver, spleen, burse, heart and thymus were removed carefully and weighed. Three blood samples were collected per group during slaughtering, one with Heparin for determination of the biochemical parameters. Plasma of Chicks was obtained immediately by centrifugation the blood for 10 min. at 3000 rpm and frozen rapidly in Eppendorf tubes until the time of analysis. Total protein, liver function enzymes and antioxidant status were measured. The results indicated that: - 1- Broilers in all treatments, which were fed in Roselle leaves had a significant effecst on final body weight as comparing to control group. - 61 The highest value was obtained with birds fed on 1.0 % followed 0.5% Roselle leaves, then the birds fed on 1.5 % compared to control ones. 2- There are a significant effect of Roselle leaves supplementation on feed consumption and feed conversion ratio. Birds fed 1.0 % Roselle leaves had the best value of feed conversion ratio, followed by those fed 1.5 % Roselle leaves, then those fed 0.5%, as compared with those fed control diet. 3- Broilers fed Roselle leaves had no significant effect on mortality rate as compared with the control. 4- There is a significant increase in carcass, bursa and thymes relative weights for broilers fed diets with Roselle leaves in 1% followed 1.5% then 0.5% as compared with those fed control diet. 5- Roselle leaves supplementation had no significant effect on the concentration of AST and ALT. 6- Roselle leaves supplementation had led to an enhancement in values of total protein, globulin, albumin, total antioxidant capacity, MDA and SOD 7- There is a significant decrease in H:L ratio and A:G ratio and a significant increase in HI titer value for broilers fed diets with Roselle leaves in 1% followed 1.5% then 0.5% as compared with those fed control diet. 8- There is a significant increase in total antioxidant capacity, and SOD and a significant decrease in MDA value for broilers fed diets with Roselle leaves in 1% followed 1.5% then 0.5% as compared with those fed control diet. Conclusion, it could be recommended that supplementation of Roselle leaves at level of 1% in broiler diets could improve productive performance, immunity indicators, antioxidant status and physiological parameters in broiler.