The study was undertaken to know the effect of feeding urea molasses multi-nutrient block (UMMB) and sesbania leaf based urea-molasses block (SUMB) on nutrient digestibility, nitrogen retention and growth performance of sheep and goats. Apparent digestibility did not differ but the digestibility of EE (59.22 vs. 39.78%, P＜0.05) and NFE (64.14 vs. 53.87%, P＜0.01), increased significantly in UMMB supplemented group. Total digestible nutrients (TDN; 62.87 vs. 54.31%) and ME content (9.57 vs 8.50 MJ/Kg DM) were significantly (P＜0.05) higher in UMMB than those of SUMB supplemented diet. The digestibility of CF (74.89 vs.65.72%), EE (56.24 vs.42.76%) and OM (71.27 vs.62.68%) were significantly (P＜0.05 to P＜0.01) higher in goats than those of sheep. Feeding of sheep and goats with UMMB significantly (P＜0.05) increased DM (186.50 vs. 148.89 g/d) and CP intake (68.48 vs. 54.81 g/d) compared to those of SUMB. Concurrently, sheep was significantly (P＜0.05) higher DM intake (either in % bodyweight or g/kg W0.75/d) than that of goat. Daily cost of feeding and per kg live weight gain was influenced significantly (P＜0.05) by feeding of multi-nutrient block. Therefore, Feeding of SUMB was cost effective (0.01 US $/d and 0.15 $/kg liveweight gain) than that of UMMB. Though the supplementation of UMMB or SUMB did not affect on intake, nutrient digestibility and weight gain but, SUMB was cost effective. Therefore, sesbania leaf based urea-molasses block can be fed to the goat and sheep as an alternative to urea-molasses multi-nutrient block.