This research was developed in the experimental center of the company Agroindustrias Florida S.A.C., located in the district of Huanchaco, province of Trujillo, department of La Libertad; during the months of February to April 2016, to determine the effect of the inclusion of the antibiotics Neomicina and Amoxicillin on the diet on the production parameters of the Cobb 500 chickens. We used 270 chickens, with a completely random design, distributed in Three treatments: T0 without antibiotics, T1 with Neomycin 150 ppm + Amoxicillin 150 ppm + Monensina 100 ppm, supplied from day 4 to 14 days of age, T2 with Neomycin 150 ppm + Amoxicillin 150 ppm + Monensina 100 ppm, delivered from day 1 to 14 days of age. The three treatments were challenged the first day with a mixture of E. coli and Staphylococcus sp., Inoculating 150 ppm each, 1 ml was given for each baby chicken. In the final weight pa...