This thesis report on the "Use of protein of animal origin in diets for improved creole sheep, in the fattening stage" carried out in the VAQUIA SAC stable, with the aim of determining the effect of the use of protein of animal origin in diets for improved creole sheep, in the fattening stage, the same ones that were distributed in the pens according to the treatments, in each pen there were 33 sheep, the Completely Random Design (DCA) was used with a total number of two treatments: T0 (Control): 0%, T1 (With protein of animal origin): 2.5%, and 33 repetitions. The protein of animal origin was included in the food respectively, in the T1 treatment. The initial weight (kg), feed consumption, final weight (kg) were recorded and the variables were evaluated as weight gain, feed conversion, mortality, benefit-cost ratio. The results obtained showed that the T1 treatment obtained a significan...