The following research consisted of 500 broiler chickens were distributed in four treatments with two repetitions, only in the initial stage (0 - 3 weeks). The study was done to determine the effect of lactosuero as a supplement in feeding for broiler chickens, supplied in liquid form, in three concentrations (10%, 15% and 20%). The lactosuero was applied as a supplement in the drinking water, mixing it daily with water treatments (T1: 10%) (T2: 15%) (T3: 20%) in a ratio of (1:9 ie 1 L of lactosuero per 9 L of water) (1.5:8.5 ie 1.5 L of lactosuero per 8.5 L of water) (2:8 or 2 L of lactosuero per 8 L of water). The control treatment was given water and B complex in intensive farming. As for the Power System in the control treatment (T0), food was traditional, that is, with all the inputs required for breeding and in treatments (T1, T2 and T3), the food was not added fishmeal, that provi...