The effect of fermented feed on Lactobacillus In contrast, mixing fermented feed with a diet reduced E. coli and Clostridium in the gastrointestinal tract of Noi chickens after 14 weeks. This can be explained when probiotics increase, causing pathogenic bacteria such as E. coli and Clostridium (P<0.05) to decrease compared to not adding fermented feed. Especially the PM treatments was the best results (E. coli and Clostridium the lowest).