Abstract: This experiment was conducted to evaluate the effect of feeding different levels of Brewer’s Dried Grain Yeast mixture (BDGY) on the performance of white leghorn chicks. A total of three hundred twenty four day-old white leghorn chicks were grouped in to 18 pens of 18 chicks each, and randomly assigned to six treatments (control; 6% BDGY; 12% BDGY; 18% BDGY; 24% BDGY; 30% BDGY) according to a completely randomized design (RCD). Brewer’s Dried Grain Yeast mixture was composed of 80% brewer’s dried grain (BDG) and 20% brewer’s dried yeast (BDY).