Background: the relatively high concentration of polyunsaturated fatty acid in yellow corn may reduce the quality of pork fat, but feeding barley instead of yellow corn may increase pork quality. Objective: to determine the effects of feeding graded levels of barley on performance, carcass composition, and pork quality of finishing pigs. Methods: in experiment 1, diets containing 0, 20, 40, 60, or 80% barley were fed to pigs (initial BW: 67.9 kg) for 8 weeks. In experiment 2, a diet containing 60% barley was fed to pigs for 0, 2, 4, 6, or 8 weeks prior to slaughter. Results: feeding diets with increasing levels of barley resulted in a linear decrease in daily gain (p