The main aim of this work was to evaluate the agronomic behavior and nutritional composition of ten varieties of improved pastures in the agroclimatic conditions of the Nuevo Olmal Annex in the Sonche district. For this, the experimental design of randomized complete blocks (DBCA) with 10 treatments and 3 blocks was used. The gramineous forage species studied were: Gramilla, ryegrass ecotype Cajamarquino, ryegrass tetraploid biannual Austral, ryegrass Hybrid Boxer, ryegrass tetraploid Magnum, Festulolium, Dactylis Glomerata Mammoth, ryegrass tetraploid annual Jumbo, Festuca Alta and ryegrass bi-annual tetraplioid Hercules. In our study, the variables studied were green forage yield per hectare, percentage of dry matter and nutritional content; the results of the analysis of variance indicated significant differences, (p < 0.05) for all the variables. The Bonferroni test at 5% determined ...