الفهرس 
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Abstract
This study was carried out in a broiler farm under the supervision of Animal Production Department, Faculty of Agriculture, Tanta University during the period from February to April 2018. This study aimed to determine the effect of dietary cinnamon at different levels in broilers diet on growth performance and some blood parameters. Three hundred one-day-old unsexed Cobb broilers chicks were used in this experiment. Birds were wingbanded, individually weighed to the nearest gram, and randomly distributed into five equal experimental groups; with three replicates of 20 chicks each. Dietary treatments evaluated included: T1 (control) Basal diet without any addition T1 Basal diet supplemented with 0.5% cinnamon in diet T2 Basal diet supplemented with 1% cinnamon in diet T3 Basal diet supplemented with 2% cinnamon in diet T4 Basal diet supplemented with 0.0275% Neomycin Chicks were housed in floor pens bedded with wood shavings which were cleaned thoroughly with formaldehyde and potassium permanganate solution three days prior to arrival of birds. House ambient temperature was maintained at 33±1oC for the first 3 days and then gradually reduced according to normal management practices. Chicks were offered three cornsoybean meal basal mash diets that were formulated to meet or exceed the nutritional requirement of growing chicks as recommended by the National Research Council (NRC). Individual body weight , Feed consumption , Feed conversion ratio (FCR) and mortality rate were measured. Blood samples were collected to determination of the biochemical parameters. The results indicated that:- 1- Significant differences (P≤0.05) were observed among all treatments during the experimental period, for live body weight and body weight gain, the highest Wight observed in birds fed 1% cinnamon (+16.19) compared to control. 2- Significant differences (P≤0.05) were observed among all treatments during the experimental period, for feed consumption, the highest feed consumption observed in birds fed 1% cinnamon and the lowest was the birds fed antibiotic. 3- Significant differences (P≤0.05) were observed among all treatments during the experimental period, for feed conversion ratio (FCR), the highest FCR observed in birds fed 1% cinnamon and the lowest was the birds fed 0.5% cinnamon compared to control birds. 4- Significant differences (P≤0.05) were observed among all treatments during the experimental period, for relative weight of carcass, liver and thymus, the highest carcass percentage observed in birds fed 2% and 1% cinnamon then control birds. The highest liver percentage observed in birds fed 0.5% cinnamon and the lowest was the birds fed 2% cinnamon compared to control birds. The highest thymus percentage observed in control birds and the lowest was the birds fed 0.5% cinnamon. 5- The results indicated that there were no significant effect of cinnamon or antibiotic in the diet on mortality rate. 6- Significant differences (P≤0.05) were observed among all treatments during the experimental period, for values of total protein, SOD,TBARs and TAC. The highest total protein value was observed in birds fed 0.5% cinnamon.The highest SOD value was observed in birds fed 2% cinnamon.The highest TBARs value was observed in 1% or 2% cinnamon. The highest TAC value was observed in 1% or 2% cinnamon. 7- Data showed that the best values for total cholesterol, triglyceride, HDL and LDL were noted in birds fed 1% cinnamon compared to control birds Conclusion: This study indicates the effectiveness of cinnamon as a catalyst for the growth and production performance of broilers. Also, raise the efficiency of the immune system and achieve the highest economic efficiency. So we recommended adding cinnamon at 1% in broiler diets under Egyptian conditions.