The smallest gain (104 g) was recorded for birds on the diet containing pork MBM (MBM 6). This gain (168 g) is lower than the 317 g that was reported (Kim and Corzo, 2012) for the average of 2 male stains (average of strains A and B) fed a semipurified diet containing an animal byproduct. Differences in performance of birds fed MBM from different sources have been reported by Parsons et al. (1997) when they fed 14 different types of MBM to broiler chicks for 9 d. In addition to strain effects, other reasons that may have affected BW gain in birds fed the MBM diets might include MBM mineral and CP contents and the inclusion of dextrose in the experimental diets used in the study of Kim and Corzo (2012). Although