The following thesis have title “USE THE LACTOSUERO, IN THE SUPPLY OF CHICKENS BROILER WITH LOW SHARES IN PROTEINS (13 % and 15 %), IN STAGE OF ENDED FOR POLLIPAVOS OBTAINING ( 8 - 11 weeks)”.; With the aim to contribute to the knowledge of new forms of supply, more efficient and economical of chickens for meat (broiler); in the Region San Martin; It was realized in the district of the Band of Shilcayo, area of the Center of Agricultural Production “Miraflores”, Faculty of Agrarian Sciences of the National University of San Martin, Located in the area "Ahuashiyacu"; the zone presents an average annual rainfall of 1213 mm / year. Everage temperature of 26.2°C, maxim of 28°C and minim of 34°C; also a Relative Dampness of 78.5 %. Used the Design completely at random (DCA), with three treatments and two repetitions. The treatments were To: (18 % of P.T), T1: (13 % of P.T), T2: (15...