الفهرس 
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Abstract
The present study was planned to investigate the effect thermally oxidized palm oil, cinnamon on broilers performances, PPAR-α gene expression this in addition to the extent of the protective effect of cinnamon. A total number of 150 one d-old cobb broiler chicks were randomly divided into five treatment groups. The first group was served as control and fed the basal diet. While, the 2ndgroup fed the basal diet supplemented with 5% fresh palm oil, the 3rd group fed the basal diet supplemented with 5% thermally oxidized palm oil, the 4th group fed the basal diet supplemented with cinnamon 2g/ kg diet, the 5th group fed the basal diet supplemented with 5% thermally oxidized oil in combination with 2 g cinnamon powder. The experiment was lasted till chicks were 42 d old. Body weight, feed consumption, feed conversion ratio was estimated, plus estimation of PPAR-α gene expression in liver tissue, lipid profile in serum, cholesterol level in the liver tissue, Correlation between the cholesterol level in both serum and liver tissue, oxidative stress markers in serum. The results showed that addition of thermally oxidized oil decrease the body weight, reduce the feed consumption, and increase feed conversion ratio. Cause significant increase in the PPAR-α gene in liver tissue, increase the cholesterol concentrations in serum and liver and elevate triglycerides in serum. Elevate the oxidative stress markers. While cinnamon cause significant increase in the LBW, feed consumption and improve the FCR. Also cinnamon cause significant decrease in TC, in both serum and liver tissue. Cinnamon decrease MDA level, SOD, CAT activity in in G4 group in comparison to G3 at 3rd W and 6th W and in G5 at 6th W of age.