One hundred and twenty native muscovy ducks, aged of four weeks were fed with four diets: diet 1) concentrate + broken rice+ rice bran; diet 2) concentrate + sago palm meal + rice bran; diet 3) concentrate + sago palm meal + palm kernel cake and diet 4) of the muscovy on the four diets were as follows: average daily gain 18.74, 17.32, 17.39 and 16.97 grams: feed conversion ratio 6.58, 7.57, 8.27 and 7.94; and feed cost per kilogram weight gain 38.45, 43.44, 45.51 and 37.33 baht, respectively. The ducks fed diet one had a significantly (p<0.05) better feed conversion ratio than other groups. However, the avergae daily gain among groups were not statistically significant different. And the diets had no effect on carcass percentage and quality of ducks meat.