Europe has long been deficient in protein rich foodstuffs and relies heavily on imported soya bean meal for pig diets. Rape seed meal (RSM) represents an alternative protein source. However, nutrient availability in RSM is limited due to the presence of anti nutritional factors which may act on the nutrient themselves or cause a deleterious physiological effect on the animal. The major antinutritional factors found in RSM include glucosinolates and tannins. One method of destroying these antinutritional factors maybe by the use of heat treatment. The objective of these experiments were to examine the effect of extrusion cooking on the apparent nutrient digestibility of RSM and on the productive performance of finishing pigs fed increasing levels of both raw and extruded “00” RSM.