The aim of this study was to determine the intake and digestibility of diets with different amounts of fruits of Senna spectabilis. The experiment was carried at Las Brisas Farm of the University of Tolima, Colombia. Twelve hair lambs (22 ± 2.5) were individually housed in digestion crates in 4 × 4 Latin square design. Each period consisted of 14 d of adaptation and 5 d of sample collection. The feeding treatments evaluated were based on hay from Dichantium aristatum with incremental amounts of S. spectabilis: 0, 15, 30, and 45%. The digestibility of the diets was determined through the total stool collection. Twelve crossbred male lambs were assessed, with an average weight of 22 kg (±4.49) housed for 14 d in a shed for adaptation to the experimental diets and 5 d in metabolic cages for the recollection and weighting of the food and feces of each experimental period. Data was analyzed using PROC REG of SAS version 9.1. The results (Table 302) show that the DMI was not influenced by the inclusions of S. spectabilis; however, CP intake did improve as fruit inclusion increased (P < 0.0001). The amount of S. spectabilis was directly correlated with the improvement in the digestibility of DM, OM, and CP (P < 0.0001). We conclude that the inclusion of the fruit S. spectabilis can improve consumption of CP and the in vivo digestibility of DM, OM, and CP in hair lambs. In vivo digestibility of the DM, OM, and the RP in lambs fed with varying levels of fruits of S. spectabilis In vivo digestibility of the DM, OM, and the RP in lambs fed with varying levels of fruits of S. spectabilis