Inclusão de glicerina bruta e aditivos microbianos em silagem pré-secada de Tifton 85

Abstract

The objective of this work was to evaluate the effect of the inclusion of glycerin and microbial additives on the fermentation quality, microbiological and nutritional characteristics of pre-dried Tifton 85. The experiment was allocated in a completely randomized design, in a 3x3 factorial scheme, two doses of glycerol (0, 60 and 120 of MN ensila), and three commercial inoculant types; ("SIL" composed of Lactobacillus plantarum and Pediococcus pentosaceus, "INC" composed of Bacillus subtilis, Lactobacillus plantarum and Pediococcus acidilactici and distilled water with five replicates per treatment (experimental mini-silos). The parameters evaluated were: losses of dry matter and gases, pH, PT (Buffer Power), EA (Aerobic Stability), bromatological composition, fatty acids and in vitro digestibility. The populations of facultative aerobic, acid-lactic, filamentous fungi and yeast were also measured. The inclusion of 120 grams of crude glycerin in relation to the control treatment had lower gas losses (531.4 grams less than loss compared to control), lower pH (4.84) and improved fiber quality by reducing contents of NDF, FDA, Hem, celulose. The inclusion of crude glycerin contributed to decrease fermentation losses and improved the bromatological composition of the pre-dried silages. The inclusion of inoculate SIL increased the pH (5.08) of the silage in relation to the treatment without microbial inoculant (4,92). There was no significant difference between the populations of filamentous fungi, yeasts, lactic acid bacteria and mesophilic bacteria, since they obtained higher (P <0.05) as a function of crude glycerin doses and microbial inoculates in pre-dried Tifton 85 silage.