This study investigated differences in carcass characteristics and ileal mucosal morphology in pigs offered 4 isocaloric grower-finisher diets formulated using non-conventional feedstuffs from 99-180 days of age upon which barrows were slaughtered. The diets consisted of a basal maize-soybean meal diet, a 20% cold-pressed canola meal diet, 20% rice polishing diet and 20% rice bran diet. The 20% rice polishing diet resulted in a higher (p≤0.05) average daily gain compared to pigs on the basal diet. Rice polishing diet resulted in an increase in killing-out percent, 24.5% increase in loin eye area which implied better lean tissue deposition and a 19.3% decrease in villous height, and noted increases were significantly different (p ≤ 0.05). The 20% rice bran diet resulted in a higher (p≤0.05) average daily gain compared to pigs on the basal diet and larger loin eye size (p ≤ 0.05) implying better lean tissue deposition. Ileal villi were significantly longer (p ≤ 0.05) in in pigs fed rice bran diet and was attributed to higher dietary fibre. The 20% Canola meal diet increased (p ≤ 0.05) back-fat thickness and an increase (p ≤ 0.05) in ileal crypt depth. The study concludes that high NDF rice bran has reduces backfat and increases gut surface area thereby improving utilisation of dietary fibre. Low protein non-conventional feedstuff in finisher pigs had beneficial effects on ileal epithilia. Further studies on the role of dietary lipids and glycosinolates commonly present in Canola meal on changes in intestinal epithelial morphology should be done.