Quality of silages can be defined in many ways. In vitro gas production and in situ techniques can be considered as useful indicators, and low cost for the preliminary evaluation of the likely nutritive value of ensiled by-products. This study showed that applying of sulfuric acid (especially 2%) gave the highest in vitro cumulative gas production parameters and in situ dry matter degradability in comparison to the all evaluated treatments. Generally, the ensiling of BG with molasses and sulfuric acid caused to improving the nutritive value of them. Also, the result of this study showed that, supplementation of BG silages with different additives such as sulfuric acid and molasses can be effective in prevent of mould growth when it is compared with the control group (mould pollution of molasses and sulfuric acid treatments when opening, was less than the control group). Ensiled BG showed a great variation in chemical composition. Nonetheless, more research is needed to investigate effects of different additives on nutritive value of ensiled BG by in vivo and other in vitro methods.
ACKNOWLEDGEMENT