الفهرس 
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Abstract
The objective of this trails was to determine the impact of early feeding (in ovo injections) with some natural substances including (Astragalus kahericus polysaccharide-AKP and resveratrol-RV) on performance, feed utilization, carcass weights, immunity, liver and kidney function, lipid profile, and antioxidant parameters in broiler chicks. Two experiments were conducted; in the first experiment, at the 7th day of incubation, a total 250 eggs were randomly divided into five groups with 5 replications of 10 eggs of each: negative control (without additive), positive control (saline injection), 1.5 mg AKP, 3.0 mg AKP, and 4.5 mg in ovo AKP injections. In the second experiment, at the 7th day of incubation, a total of 300 eggs were divided into five treatment groups with 6 replications (10 eggs of each): negative control (without additive), positive control (saline injection), 1.5 mg RV, 4) 3.0 mg RV, and 4.5 mg in ovo RV injections. The experiments were lasted for 5 weeks after hatch. The results indicate that: In the 1st experiment, apart from the control groups, no significant changes in body weight at 3 and 5 wks of age, and daily weight gains during 0-3 wks of age were detected among the treatment groups. Daily feed consumption was decreased in AKP groups, while feed conversion ratio was improved with AKP when compared to the PC. AKP injections significantly altered the lipid profile parameters, including total cholesterol, triglycerides, low-density lipoproteins, and very low-density lipoproteins in the plasma (P < 0.05); but there were no statistical differences in HDL (P > 0.001). AKP injections significantly impacted biochemical blood parameters, including total protein, albumin, and globulin, in broiler chicken plasma (P < 0.05). Liver and kidney functions were influenced by in ovo AKP injections in broilers. Antioxidant enzymes also changed significantly after in ovo injection with AKP. Moreover, in ovo injection of AKP significantly altered immunity (IgG and IgM) in broilers. In conclusion, in ovo injection of AKP significantly improved liver and kidney functions, antioxidant activity, and immune function in broilers. In the 2nd experiment: no significant changes in final body weight and daily gains were detected among treatment groups. Significant changes were found in feed intake and feed conversion ratio due to different levels of RV. In ovo injection of RV significantly altered the parameters of lipid profile, including total cholesterol, triglycerides, low-density lipoproteins, and very low-density lipoproteins, in plasma (p < 0.05). There were no significant differences in HDL (P > 0.001). RV injection into broiler eggs significantly affected blood biochemical parameters, including total protein, albumin, and globulin in broiler chicken plasma (p < 0.05). Liver and kidney functions were influenced by the injection of RV into eggs of broiler chickens. The antioxidant enzymes also were changed significantly after RV injection. Moreover, in ovo injection with RV, the immunoglobulin (IgG and IgM) in broiler chickens were significantly improved. In conclusion, in ovo injection with RV significantly improved liver and kidney function, antioxidant activity, and immune function in broiler chicks.