The University of Georgia Animal Care and Use Committee approved all procedures. Six hundred thirty male by-product broiler chicks (Cobb 500) from a female parent stock were obtained from a local commercial hatchery. Chicks were housed in thermostatically controlled Petersime batteries (Petersime Incubator Co., Gettysburg, OH) with raised wire floors in an environmentally controlled building. At hatch, chicks were weighed and randomly allotted to pens so that each pen of 15 chicks had a similar initial weight and pen weight distribution. Chicks were allowed ad libitum access to the control (corn-soybean) and 6 dietary treatments through 18 d of age. There were 6 pens of 15 chicks per replication. Feed and average pen weights were recorded on d 0, 11, and 18 for determination of BW gain and adjusted feed conversion ratio. At the end of the study, birds were tagged, euthanized by carbon dioxide, and stored in the cooler overnight. The next day, the birds were weighed individually; fat pads were removed and weighed.