We examined the replacement of soy isolated protein by a solid fraction coming from brewery liquid waste, in the preparation of soy protein and brewer's yeast mixtures (50:50) to feed growing chickens. The replacement of 20 percent soy protein by brewery waste protein to the diet, showed no significant differences in the growth and food intake of the chickens, when compared with soy protein fed chickens. Protein Efficiency Ratio (PER) and Net Protein Ratio (NPR) values of the diets were also very similar and the concentration of plasma and liver lipids remained approximately the same. Higher levels of brewery waste reduced the performance of chickens although total lipids, cholesterol and triacylglycerols in plasma, as well as total lipids and cholesterol in liver were not affected. The data reported here indicated that brewery waste can be used as a complementary protein source in broiler chicken diets.