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National Research Institute of Animal ProductionDepartment of Animal Nutrition and Feed Science32-083 Balice, Poland(Received 21 November 2005; revised version 9 January 2006; accepted 12 April 2006)ABSTRACT In an experiment on 84 Lohman Brown hens (from 26 to 68 weeks of age), the effect of the different dietary levels of maize distillers dried grains with solubles (DDGS) on laying performance and egg quality was studied. Experimental diets were isocaloric and isonitrogenous and contained 0, 5, 10, 15 or 20% DDGS. The diet with 20% DDGS was also supplemented with NSP-hydrolizing enzymes or with enzymes and additional amounts of lysine and methionine.In the rstphaseofthelayingcycle(26-43weeksofage)thedietarylevelofDDGSdidnotsignicantlyaffectthelayingrate,dailyweightoflaideggs,feedintakeandfeedconversion.Inthe second phase of the cycle (44-68 weeks of age), there were no differences in egg production parameters between groups fed diets with 0, 5, 10 and 15% DDGS. A dietary level of 20% DDGS negatively affected laying rate and daily weight of eggs, however, addition of NSP-hydrolizing enzymes to the diet reduced in part this negative inuence.ThelevelofDDGSinthediethadno effect on albumen height, Haugh units, eggshell thickness, density and breaking, or sensory properties of boiled eggs. Yolk colour score signicantlyincreasedwhenDDGSwasincludedinthe diet. KEY WORDS: maize DDGS, laying hens, laying performance, egg quality, yolk colourJournal of Animal and Feed Sciences, 15, 2006, 253–260

Effect of maize distillers dried grains with solubles and dietary enzyme supplementation on the performance of laying hens