The addition of probiotics to poultry diets has been explored as a method to improve immune health [3], increase egg quality parameters [4], improve feed conversion [5,6], and reduce pathogen colonization and shedding [7]. Probiotics, also called direct-fed microbials (DFM), are defined as a live microbial feed supplement which beneficially affects the host by improving its intestinal microbial balance [8]. Direct fed microbials are relatively inexpensive and can be easily added to both feed and water at anytime in the production cycle. Russell and Grimes investigated the effect of a dietary DFM on the performance of commercial turkeys [6]. The addition of a DFM resulted in improved mean body weight (BW) and feed conversion ratio (FCR) in female and male turkeys reared to 18 and 20 weeks, respectively [6]. In addition, in two field trials, water delivered DFM resulted in a nominal improvement in bird livability, mean BW, total farm weight of birds, and FCR while cost of production was decreased ($0.0195/kg). Davis and Anderson also reported significant