Produção de silagem pré - secada com diferentes gramíneas de clima temperado

Abstract

This study evaluated the production and nutritional quality of temperate grasses, being the same: White Oats IPR 126 (ABR), oat IAPAR 61 (AV), Barjumbo Ryegrass (AZ) and Rye Temprano (EC), through the making of haylage in two different phenological stages: vegetative and reproductive. The experiment was conducted at the Universidade Tecnológica Federal do Paraná, Campus Dois Vizinhos. The experimental design was randomized blocks (DBA) in a factorial model, evaluating the factor cultivar and phenological factors of grasses. The cultivar factor had four levels (ABR, AV, AZ and EC), in which we evaluated the qualitative and quantitative differences between them, and the phenological factor were evaluated at two levels: the vegetative and reproductive stages, totaling (4X2) 8 treatments with 4 replicates. The ensiling grasses occurred when reached values higher than 35% dry matter, this process was carried out in micro PVC silos (500 mm long by 100 mm diameter). Two cuts were performed, one with the plants in the vegetative stage and another in the reproductive stage. The first cut (vegetative phase), was held on July 6, 2012, totaling 70 days from sowing to cutting. The second cut (reproductive phase), was held on August 23, 2012, which totaled 117 days from sowing to cutting. The pre-drying with an average content of dry matter, and around 35% had to be efficient for the conservation of winter grasses, silage and managed to preserve the maximum quality of the same. The oat and oat IPR 126 IAPAR 61 stood out in relation to dry matter production compared to rye and ryegrass Barjumbo, and the best growth stage for this variable was the breeding. The best nutritional values in the silages were pre-dried for rye Temprano and ryegrass Barjumbo vegetative stage.