Thus, the maturation and optimal development of intestinal could be considered as a reason for the boost nutrient digestibility and growth performance in this study. However, to the best of our knowledge, study conducted to evaluate the effect of BV or its by-product on finishing pigs is limited. The exact mechanism by which the BV affected the nutrient digestibility and growth performance is unknown, further study is still necessary. For example, Dibner and Buttin (2002) have suggested that acidifier can cause an increase in digestive enzyme activity, microbial phytase activity and increase pancreatic secretion