Utilização de inoculantes microbianos produtores de ácido acético em silagens de sorgo forrageiro

Abstract

The objective of this study was to evaluate the effect of inoculation with acetic acid-producing lactic acid bacteria on chemical composition, losses during ensiling, fermentative profile, microbial populations and aerobic stability in forage sorghum silage. A completely randomized experimental design was used, arranged in a 7×2 factorial scheme, with seven treatments and two opening periods (30 and 80 days), with four replications. Of the treatments, five are the strains of lactic acid bacteria isolated from forage sorghum, as well as a control treatment – without inoculant, and Weissella cibaria. There was an interaction effect between treatments and openings for the levels of losses by effluent (P= 0.0004), where the control treatment obtained 4.73 kg t-1 for the opening of 80 days, and losses by gases ( P=0.0001), where Lactiplantibacillus plantarum (GML 51) stood out with 0.48% MS. There was an interaction effect between treatments and openings for the levels of BAL (P= 0.0001) and LEV (P= 0.0001), with 5.37 colony forming units per gram of silage for Lactiplantibacillus plantarum (GML 09) at 30 days opening and 2.42 colony forming units per gram of silage for the control treatment at 80 days opening. As for aerobic stability, among the treatments, Lactiplantibacillus plantarum (GML 66) and Weissella cibaria stood out (P=0.0001), with 71.75 and 68.87 h, respectively. Thus, it is recommended to use Lactiplantibacillus plantarum (GML 66) in forage sorghum silage.