This research was conducted in the company SLLC EIRL Agricultural Investment located in the district of Laredo province of Trujillo, La Libertad, in order to determine the effect of the addition of purified nucleotides in feed on performance of muscovy duck. T1: control, T2: 0.025% nucleotide T3: 0.050% nucleotide and T4: 80 randomized BB ducks under a RCB design with two blocks (sex duck) and four treatments utlizaron from 0.050 to 0.025% nucleotide in the stages of pre startup and in the diets of ducks. For statistical analysis were used, the corresponding ANOVA design, the weights in the 11th week of age highly significant differences between treatments were calculated, with treatment 4 which reached the top weights in males at 4.31 kg in females 2.49 kg and 3.68 kg total; with respect to the other treatments (p <0.01). Treatment 4 scored higher total weight gain with 3.64 kg, followe...