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Growing heifers grazing smooth bromegrass pastures were supplemented daily with dry distillers grains, corn bran + corn oil, or corn bran + corn gluten meal to determine the relative contributions of fat and undegradable intake protein in dried distillers grains to animal performance. For cattle supplemented from 0 to 0.75% body weight with dried distillers grains, ADG was improved by 0.14 lb for every 0.10% BW increase in dried distillers grains supplementation. Cattle supplemented with corn bran + corn gluten meal gained 38% as much as cattle supplemented with dry distillers grains while cattle supplemented with corn bran + corn oil showed no improvement in ADG over cattle supplemented with a corn bran control supplement. Neither fat nor undegradable intake protein account for all the observed improvement in ADG from supplementing dry distillers grains.