Increased costs in commercial supplements of milk production have sparked the need to seek partial substitutes such as brewery silages. A test was conducted at Corpoica’s Tibaitatá Research Center with 12 Holstein cows grazing in kikuyu grass pastures (Pennisetum clandestinum) in the second third of lactation, over the course of 70 days, divided into three treatments: 1) brewery mash silage standard and commercial supplement, 2) energy enriched mash silage and commercial supplement, 3) commercial supplement. We used analysis of covariance in a completely randomized design with production and nutritional indicators, and the technique of partial budgets for economic analysis of diets. Significant differences between treatments (P≤0.001) for milk production were observed with 17.09, 19.24 and 19.15 kg/cow per day for the treatments with standard silage, with energy enriched silage and without silage, respectively. There were no significant differences (P≤0.001) between treatments in milk quality, obtaining levels of 3.57, 3.54 and 3.70% for milk fat and 2.94, 2.93 and 3.02% for dairy protein in the treatments with standard silage, with energy enriched silage and without silage, respectively. Body condition did not show significant differences between treatments, but recovery of this indicator was observed during the trial. Economic analysis of diets reported significant differences (P≤0.001), with feeding costs of $ 4,230, $ 4,425 and $ 5,027 per cow/day and rates of return of 2.23, 2.48 and 2.05 for the treatments with standard silage, with energy enriched silage and without silage, respectively. ; El aumento de los costos en los suplementos comerciales de la producción láctea, plantean la necesidad de buscar sustitutos parciales como los ensilajes de cervecería. Se realizó un ensayo en el Centro de Investigación Tibaitatá de Corpoica con 12 vacas Holstein en pastoreo de praderas de kikuyo (Pennisetum clandestinum), en segundo tercio de lactancia, durante 70 días, distribuidas en tres tratamientos: 1) ensilaje de ...