Probioticsbeneficiallyaffectthehostanimalbyimproving its intestinal microbial balance. These bacteria are defined as live microorganisms that are host originated, nonpathogenic, resistant to gastric acid and bile. They have a high affinity for attachment to the mucosal wall, produce inhibitory compounds, and adjust to immune responses (Patterson and Burkholder, 2003). They produce beneficial changes in gut flora by manufacturing acids that inhibit the growth of harmful bacteria (Sun, 2005).