Maize is the principal energy source in most poultry diet in developing countries. As the cultivating of maize is limited in Iran, annually a large amount of maize is imported. Broken rice (BR) is a major cereal by-product for animal feeding in rice-growing countries. The annual production of rice paddy in Iran is about 2 million tonnes. After milling of paddy, broken rice is available for utilization in animal diet. BR consists of 40 to 80 g/kg of rice paddy. It contains good sources of protein (100-110 g/kg), fat (60-110 g/kg), carbohydrate, fibre (20-50 g/kg). Due to mixing with bran and hull the chemical composition of BR varies in different samples. In some part of the country the price of this ingredient is lower than maize. The objective of the present experiment was to evaluate the effect diets containing different levels of BR on performance of broiler chicks from 1 to 8 weeks of age.