Two experiments were conducted to determine the impact of dietary copper concentration and source on odor characteristics of swine waste. In both experiments, 192 weanling gilts an barrows were alotted 24 pens. Pen were randomly assinged to one of six dietary treatments consisting of control, 66 or 225 ppm Cu as CuSO4 or 33, 66, or 100 ppm Cu as cupric citrate. An antibiotic was added in the diets for experiment 1 but not 2. On day 28 fecal samples were randomly obtained from one pig per pen stored at -20 degrees Celsius until preparation and evaluation by an odor panel. The odor panel consisted of 10 individuals, and each panelist evaluated the odor intensity, irritation intensity, and odor quality of the air samples. In experiment 1 the odor and irritation intensity of the feces were lower from animals consuming 225 ppm Cu and 66 or 100 ppm as compared to the control. The odor quality of the waste from animals consuming diets containing and 66 or 100 ppm was impri=oved compared to the 33ppm treatment. In experiment 2, the odor intensity of the feces of the pigs receiving diets supplemented with all concentrations of Cu-citrate was lower than that of feces from the control animals. Irritation intensity of the feces was not affected by treatment. Odor quality of wase of pigs supplemented with 225 ppm Cu from copper sulfate and all concentrations of Cu-citrate was improved when compared tothat of wste of the control pigs.