The aim of this study was to investigate growth performance of growing-finishing pigs in response to high planes of nutrition. Seventy-two Yorkshire barrows weighing approximately 26 kg were randomly allotted to one of three planes of nutrition: ‘BASAL,’ ‘high’ (HI), and ‘extra-high’ (X-HI). BASAL, HI, and X-HI grower diets contained 1.15%, 1.25%, and 1.35% lysine and 3.48, 3.54, and 3.60 Mcal DE/kg, respectively; finisher diets had 1.10%, 1.10%, and 1.20% lysine and 3.43, 3.50, and 3.57 Mcal DE/kg, respectively. The animals were placed on the grower and finisher diets for 40 and 63 days, respectively, and slaughtered. Average daily gain, which did not differ among the three dietary groups during the grower phase, was greater (p<0.05) in the X-HI group than in the other two groups during the finisher phase (811, 862, and 842 g during the grower phase and 855, 884, and 953 g during the finisher phase for the BASAL, HI, and X-HI groups, respectively). Dressing percentage of the carcass was greater in the X-HI than in the other two groups, backfat thickness tending to be less in the X-HI group vs. BASAL (p=0.09). Results suggest that the growth rate of growing-finishing barrows could be increased by placing them on a high plane of nutrition.