Total of 180 day-old Anake-2000 broiler chicks were divided randomly into equal four treatments, to study the effect of dietary different levels (10, 20 and 30 %) of extruded full-fat soybean seed on growth performance, feed efficiency, carcass characteristics and some blood constituents. Chicks fed diets contained extruded full-fat soybean seed had significantly higher weight gain values, although feed consumption was decreased when compared with the control group. As  a result, feed conversion was improved for all chicks fed extruded full-fat soybean. Dietary different levels of extruded full-fat soybean decreased blood cholesterol content. Also, liver content of  cholesterol and total lipids were decreased. On the other hand, the highest value for proportional carcass weight was observed with chicks fed 20 % extruded full-fat soybean. Moreover, the same treatment was economical than the other treatments.