This study was carried out to determine the effects of a liquid feed additive (Uramel) containing urea and molasses on dairy cattle diets on milk production and composition. Twenty-one lactating Brown Swiss dairy cattle were used. The research was conducted for 71 day including the first 15 day adjusting period and the last 56 day experiment period. Animals were divided three groups as control, first and second groups according to milk production, body weight, age and lactation period. Cows were fed rations containing 9.8 kg/day concantre and 6 kg/day hay in control group; 3.7 kg/day concantre, 4 kg/day barley, 8.2 kg/day hay and 0.6 kg/day uramet in first group (Ura-ot): 6 kg/day barley straw, 6,5 kg/day barley, 2.6 kg/day sunflower meal, 0.5 kg/day bran and 0.6 kg/day uramei in second group (Ura-sam) , Forage and concantre feeds were weighed daily and ted as two equal meals in group feeding design. Uramei was given two time in a day as top dressing on concantre. Milk was weighed each other two weeks and analysed for milk composition in 28th and 56th day. Average mitk production, milk fat and protein concentration were determined 10.97, 11.05 and 9.11 kg/day; 3,61, 4,02 and 3.78 % ; 3.75, 4,07 and 3.96 % in control, first and second groups, respectively and there was no significant difference between groups (P<0.05) , The feed cost for per kg milk in the first group was found tower 15.4 % than control group and this value was regarded economically important.