Silage is recognized as a viable option to cope with seasonal fluctuations in forage availability. Due to the reduced nutrient contents (N and soluble CHO’s) of tropical grasses, the resulting silage is usually of low quality. This factor plays a major role in the adoption of this technology by farmers in developing countries. The inclusion of forage trees to improve the nutritive value of silage is seen as a viable alternative, as forage trees are locally available and farmers are increasingly implementing its use as supplement. Silage resulting from grass/tree mixtures might allow reduced use of conventional grain-based supplement without jeopardizing animal performance (Sol et al., 2002a,b). However, few data is available about adequate inclusion levels of forage tree and grass for silage making. Thus, the objective of the present work was to assess changes in silage quality associated with the inclusion level of forage tree.