Because fibre has a penalty on the calculated NE dueto heat loss from fermentation of fibre, the expected reduction of NE values of diets was counteracted by increased additionof oil (Noblet et al., 1994). The increase of calculated NE of diets indicated that the NE value of wheat millrun was potentiallyunderestimated. In contrast, the NE value for wheat middlings by IRNA in growing pigs was suspected to be overestimated