Abstract: Six crossbred castrate male pigs weighing on average 55 kg each were randomly allocated to 3 diets according to a duplicate 3�3 Latin square design to study digestion characteristics of cell wall fractions as determined by 0, 10 and 20% sun-dried leucaena (Leucaena leucocephala Lam. de Wit) Leaf Meal (LM) in diets based on sugar cane molasses type B and soybean meal. A significant (p< 0.01) decrease in lignin and cell content (1-NDF) digestibility was observed by increasing the level of LM in the diet. There was no treatment effect on digestibility of crude fibre and other detergent fractions of fibre. A significant interdependence was found between faecal fresh material output and WHC (p< 0.001, R2 = 0.896). It could be suggested that a moderate increase in LM up to 20% in the diet, should not determine a marked, deleterious effect on fibrous fraction digestibility as measured at the rectal site of growing pigs.