BREWERY WASTE AS A SUBSTITUTE FOR SOY PROTEIN IN SOY-BREWERS YEAST MIXTURES TO FEED BROILER-CHICKENS

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