| Summary: | Due to the increasing need to seek profitable feeding strategies for livestock that have good quality, and are of easy adoption, rose the idea of using crops by-products. In this work the effect of fresh potato waste on the production and quality of milk in 6 Holstein cows between first and second birth, with average yields of 24 L/cow/ day, which had more than 4 weeks breastfeeding was evaluated. It was worked under a completely randomized design with 2 treatments for the different percentages of inclusion of fresh potatoes, with three replicates each treatment, for a total of 6 experimental units, which were randomly divided in TC = 30 treatments % -35% + ms potato + balanced food in amount of 4.5 to, 4 kilos, T1 = 25% + ms of potato + balanced food in quantity needed to meet requirements + 100g protected fat; T2 = 20% more food potato + balanced food in the amount necessary to cover requirements + 200 g of protected fat. Significant differences were found: (p< 0.05) for T2 fat, with an increase of 1.61%, followed by the T1: 1.2%. The animals supplemented with T1 and T2 produced 0.6 and 1.7 L/day more milk compared with the control treatment, respectively. Applying the Tukey test was obtained that the best treatment was T2 with 4.92%, followed by T1: 4.46%, and the control (TC) 3.29%. For the protein, density and total solids variables, no statistically significant differences (p> 0.05) were found.
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