Diets for growing-fattening pigs are normally low in fat and based on cereals, which supply approximately two thirds of the total energy required by pigs. Restricted concentrations of oil (between 2 and 10% of total dry matter) have been used to improve growth rate and feed efficiency. Palm oil and oil palm by-products have been used as the main energy source in the growth cycle as substitutes for cereals (Ocampo and Lean 1999). The objective of this experiment was to evaluate three oils as dietary substitutes for maize grain in growing-fattening pigs, based on growth performance and carcass characteristics using ultrasonic measurements.