Was made a technical and economical evaluation of three substitution levels of commercial concentrate (16% of crude protein) by fresh Mulberry Morus indica Leaves, in growing replacement calves. Thirty calves of the Lucerna breed, weighing an average of 30 kg were fed during 112 days by means of the restricted suckling system. The statical analysis was a complete random desing, with three treatments: 100 (T 1 ) 75 (T2) and 50% concentrate (T 3 ) two replicates were taken for each treatment and five calves were the experimental unit. The nutritional quality of Mulberry leaves was high, with 85.6% of dry matter degradability at 48 hours, 15.2% crude protein, 52 tonnes/ha/year with tour harvests per year and a cost of $137. I/kg of dry matter. The average weight gains were 0.406, 0.437, 0.406 kg/day and the concentrate consumptions 0.372, 0.207 and 0.115 kg/day, for T 1 T 2 , and T 3 respectively, with statistical difference (P 2 and T 3 , respectively. The economical analysis done by the partial budget technique indicated a net income of $190.864/calf for T 2 followed for T 3 with $185.027/calf and the for TI $178.109/calf.