Ruminal degradation kinetic of Brachiaria brizantha silages with different microbial additives

Abstract

This study aimed to determine the carbohydrate fractions and estimate ruminal fermentation kinetics parameters of silages Brachiaria brizantha cv. Marandu with the inclusion of two microbial additives: Additive LPPP Pasture (Lactobacillus plantarum and Pediococcus pentosaceus) and additive BSLPPA Pasture (Bacillus subtilis, Lactobacillus plantarum and Pediococcus acidilactici). The experimental design was completely randomized with three different silages and three replications per silage. The silos were opened after 34 days of fermentation and then sent for laboratory analysis. For the fractionation of carbohydrates were determined total carbohydrates (TC), non-fiber carbohydrates (NFC), fractions A + B1 (fractions of fast and average ruminal degradation), B2 fraction (fraction slowly degraded in the rumen) and fraction C (carbohydrates no digestible in the rumen). The gas production data were fitted to a logistic model bicompartimental. There was no difference in the values of the variables of fiber degradation (FC) kinetic and no-fiber carbohydrates (NFC) of the silages. However, silages Brachiaria brizantha cv. Marandu with use of additives LPPP and BSLPPA had higher fractions of digestible carbohydrates, reducing total carbohydrates and low indigestible fiber fraction of carbohydrates. Thus, the two microbial additives improved the nutritional value of silage Marandu-grass.

Keywords

• Bacterium inoculant; Carbohydrate fractions; Degradation rate; Homolactic; Nutritional value; Ruminant