Sesbania is a rapidly growing leguminous shrub mainly used for improving soil fertility in Bangladesh. Recently farmers have shown growing interest in the use this plant as an animal feed. The main variety of Sesbania grown in Bangladesh is Sesbania aculeata(SA), however, recently a new variety has been introduced, Sesbania rostrata(SR) which has become popular with farmers due to its high production characteristics, the robust nature of the plants and the fact that it can be propagated vegetatively. A recent study has shown that the use of Sesbania leaf as a supplement to lactating cows given a urea treated straw based diet has a beneficial effect on performance (Khan et al.1989). When used as a suitable protein supplement, particularly for straws, browse legume must have a high protein content to supply both fermentable and undegradable protein and also should contain other critical nutrients & micronutrients (Preston, 1986). Since the new variety shows improved production and growth characteristics compared to SA, a comparative study was undertaken to assess their nutrient contents and the effect of time of cutting and drying method on digestibility in vitro.