Aditivos microbianos comerciais na silagem de cana-de-açúcar

Abstract

The practice of ensiling of sugarcane without additives has caused marked reduction in the silage nutritional value, due to the rapid fermentation of soluble carbohydrate by yeasts. The use of commercial inoculants containing homo and heterolactic bacteria in the ensilage process becomes an important alternative, however, the efficiency of these inoculants is questionable. Thus, we aimed to evaluate the effect of using two commercial inoculants during the fermentative process of three varieties of sugarcane on the nutritive value, fermentative losses and aerobic stability of the silages. We used a completely randomized design in a 3x3 factorial scheme (three varieties and three treatments) with five repetitions. The treatments were: no inoculant; A Inoculant (Lalsil® sugarcane, L. buchneri, strain NCIMB 40788, 2.5 x 1010 CFU/g) and B Inoculant (Silobac® 5, L. plantarum, strains CH 6072 and L286, 1 x 105 CFU/g). In all treatments, silages showed increased concentrations of NDF and ADF, and reduction in content DM in relative to material before ensiling. Treatment with B inoculant provided higher losses gases, total loss of DM and fractions of ammonia nitrogen, as well as lower levels of IVDMD and TDN, especially for variety RB92579. The A Inoculant improved aerobic stability of silages. The high concentration of sugars (Brix degree) presented by RB92579 seemed to favor the activity of the yeast and, consequently, the fermentative losses.