This study was conducted to determine the effects of dietary inclusion of Cinnamomum zeylanicum Blume and Thymus vulgaris powder on some production traits and serum and egg yolk lipid profile in Japanese quails (Coturnix Japonica). The experimental treatments were divided as control (no supplementation) and four groups (supplemented with 1.0, 2.0% of thymus powder and 1.0, 2.0% of cinnamon powder). The experiment used 100 quails (42–105 days of age) with five treatments. Each treatment was further divided into five replicates, each having four birds (1 male and 3 female bird). In this trial, cholesterol and triglyceride concentration in serum and egg yolk were determined. The results indicated that thymus powder to the diet significantly reduced (P<0.05) the concentration of egg yolk cholesterol and triglycerides. Dietary thymus and cinnamon powder decreased (P<0.05) serum total cholesterol. Serum triglycerides content was not influenced by treatments. It was concluded that 1 or 2% thymus had a positive effect on the production performance and cholesterol profile of the Japanese quail.