Nutritional and economical efficiency of three biosilages from agroindustrial wastes in beef cattle

摘要

In dairy discarded steers was evaluated tiie nutritional and economical efficiency of three biosilages from agroindustrial wastes: bagasse and leaves of Saccharum officinarum (sugar cane), leaves of Musa sp. (plantain) and fruit of Psidium guajava (guava), submitted to solid state fermentation with three microbial preparations (T1 based on whey, T2 bovine feces and T3 with the mixture of both), also a control treatment Axonopus scoparius (purple fodder) grazing. Treatments 1, 2 and 3 had 24.90, 21.97and 26.1 % dry matter; 13.00, 12.84 and 13.43 % crude protein; 30.56, 33.52 and 22.58 % crude fiber; 65.11, 60,49 and 70.11 % of lactic acid concentration; pH 4.60, 4.80 and 4.70 and ammonia nitrogen concentration of 3.05, 7.11 and 5.50 %, respectively.In a completely randomized design with three replications, 12 steers with an average initial live weight of 232.25 ± 5.12 kg were used. Animals consumed 3.07 kg/animal/d of dry matter. Best results were attained with whey silage, with a daily live weight increase of 0.50 kg, feed conversion, 6.76 and an economical profitability of 37 %. Also, there were significant differences (P < 0.01) betw'cen treatments. It is suggested tliat with this technology the nutritional quality of agroindustrial wastes can be improved and used in cattle fattening. Silage supply biologically activated with whey improves live weight gain, and mitigates environmental pollution.