RESUMO
This research evaluated the effect of molasses (M), cellulosic enzymes (E) and lactic acid bacteria (LAB) alone or in combination (Mâ¯+â¯LAB and Eâ¯+â¯LAB) on the fermentation quality, microbial counts, chemical composition and in vitro degradability of rice straw silages in different silo densities (200, 300, 400 and 500â¯kg/m3). The M or E groups alone increased the dry matter (DM) losses at low silo densities. Acetic acid produced by LAB-related groups significantly inhibited yeast and mould at the silo density of 300â¯kg/m3. Under high silo densities (>400â¯kg/m3), LAB-related additives significantly improved the fermentation quality and reduced the DM losses. The use of Eâ¯+â¯LAB further improved the in vitro degradability of rice straw silages at high silo densities. In conclusion, higher silo density and appropriate complex additives were of great significance to improve the quality of rice straw silage.