Silagem de resíduo pós colheita de sementes de Capim Miyagui conservado com aditivo microbiano e sob diferentes densidades de compactação

Abstract

The use of silage aims to maintain adequate volume for the animals, especially in the winter and dry period. Grass of the Megathyrsus maximus genus has high dry matter production and bromatological quality, ideal characteristics for the production of good silage. However, it is necessary to carry out studies aimed at improving the technical aspects of management, production and conservation of these forages. The work was developed in the agrostological field at the Federal Technological University of Paraná – Campus Dois Vizinhos to evaluate the nutritional value of silage from post-harvest residual material of Miyagui grass seeds, preserved with three levels of specific mass. The treatments were distributed in a randomized design in a 3 x 2 factorial scheme, with three different specific masses with or without inclusion of inoculant, with four replications per treatment. The specific mass levels evaluated were: D600(600 kg MV/m³), D450(450 kg MV/m³) and D300(300 kg MV/m³), which corresponded to 100, 75 and 50% of maximum capacity mini silo storage. The microbial additive used for inoculation was Silomax Centurium® 2.6x1010 CFU/g of Lactiplantibacillus plantarum and 2.6x1010 CFU/g of Pediococcus pentosaceus. The work was carried out in two stages, the first corresponding to the manual collection of material in the field, after harvesting seeds from the plant, followed by disintegration in a stationary crusher and ensiling in PVC microsilos. The second stage took place in the Animal Bromatology Multi-User Laboratory where pH was determined, such as gaseous losses (%DM), total dry matter losses (%DM) and effluent losses (kg/ton of MV), in addition to matter contents dry matter (DM), mineral matter (MM), neutral detergent insoluble fiber (NDF), acid detergent insoluble fiber (FDA) and crude protein (CP). There were no interactions between the different levels of specific mass and use of microbial inoculant (P>0.05) for the contents of dry matter, mineral matter, crude protein, neutral detergent fiber, acid detergent fiber, hemicellulose, cellulose and lignin . Regarding fermentation parameters, the different specific mass levels resulted in lower pH values and greater effluent losses in treatments D600 and D450. Therefore, the increase in mass specifically in the post-harvest ensiling process of Miyagui grass seed promotes lower pH values and reduces DM losses, bringing a positive influence on the fermentative quality of the ensiled material.