Each of two diets containing 30% naked oats, unsupplemented (diet I) or supplemented with a multienzyme preparation (diet II), was fed to 3 litters of piglets from the age of 10 days until weaning on day 52 (prestarter), to weaners until day 83 of life (grower), and to fatteners until slaughter on day 177 of life (grower and finisher). Thirty or thirty-one piglets and weaners and 20 fatteners were included in group I and II, respectively. Feeding diets supplemented with β-glucanase, hemicellulase, and pectinase increased daily gain from 251 to 266 g during the suckling period, and from 340 to 357 g from days 10 to 83 of life, and improved feed utilization in both periods compared with the control diet. Supplementation of naked oats with enzymes tended to improve fattening performance, significantly decreased loin eye area, and modified the fatty acid profile and water holding capacity of the loin, while increasing the dry matter content in ham. Feeding an enzyme-supplemented diet did not significantly affect sensory scores, but they tended to be lower in both ham and loin.