Broiler chickens were fattened for six weeks with feeds, to which 0%, 7.5% or 15% of dried flocculated sludge had been added. Tests were performed on the slaughtered birds with regard to microbiological and sensory characteristics. In addition, the concentrations of various (heavy) metals in the meat of the breast and leg were determined. Specimens of the tissues of various organs were also subjected to histopathological examination. Except for a still unaccountable increase in juicyness of the flesh of the legs of the 7.5% group and a reduction of the zinc level in that of the breast and legs, any other effects attributable to the incorporation of dried flocculated poultry sludge in the diets were not detectable.