Características agronômicas e nutricionais de genótipos de sorgo biomassa e suas respectivas silagens na região semiárida

Abstract

In semi-arid regions, the main technique used to conserve forage is ensiling, an important strategy to guarantee animal nutrition during periods of seasonal production. Biomass sorghum has characteristics suitable for ensiling and is a genotype that has stood out due to its high productive potential in regionsthat have water stress, compared to other genotypes. Due to its high fibrous fraction, the use of bacterial-enzymatic inoculants has been tested as an alternative to guarantee the conservation of nutritional value and improve digestibility. Two experiments were conducted to evaluate six genotypes, one control (forage sorghum), two commercial ones (AGRI002E and BRS 716) and three experimental ones from EMBRAPA (202033B008, 202033B011 and CMSXS7500). In Experiment I, the agronomic characteristics, chemical composition and digestibility were evaluated, following a randomized block design with six genotypes and three replications onthe field. In experiment II, the silages of the six genotypes associated or not with inoculants were evaluated regarding fermentative characteristics and losses. The experiment was conducted following a completely randomized design in a 6 x 2 factorial scheme, with six genotypes and the absence and presence of application of an enzymatic-bacterial inoculant with six replications.