Bacillus subtilis C-3102 was administered to chickens to exclude or decrease the presence of intestinal pathogens such as Salmonella and Campylobacter. In a laboratory experiment with infected chickens, results showed a decrease in the number and detection rate of Campylobacter in both the control and the experimental group. However, after day 49 only one of 10 chickens was Campylobacter-positive in the experimental group. This detection rate was significantly lower than the control (6/10). A similar effect was also noticed in the experiment with Salmonella infected chickens. In spite of a significantly high number of bacteria at day 3, the experimental group was colonized by significantly lower number of Salmonella at day 10. Thereafter the average number of Salmonella in the experimental group was lower than that of the control. In a field trial, there were significant decreases in the number (P<0.001) and detection rate (P<0.01) of Campylobacter. The detection rate of Salmonella also decreased significantly (P<0.01). Moreover, significant decreases in the number of Clostridium perfringens and Enterobacteriaceae were observed. On the other hand, a significant (P<0.05) increase in the number of lactobacilli was observed in the field trial carried out to investigate the intestinal microflora. These results demonstrated the efficiency of B. subtilis C-3102 as a probiotic additive.
Anim,Sci Technol.(Jpn) 67 (3):273-280,1996
Key Words:Campylobacter, Salmonella, B. subtilis, Intestinal microflora, Broiler