Abstract
The present study evaluated the effects of microbial inoculants on chemical changes and aerobic stability efficiency in Tanzania guinea grass silage. The treatments consisted of C: silage without inoculant; I: silage inoculated with Lactobacillus plantarum (CCT 0580) 8.0 x 109 CFU g-1, Bacillus subtilis (CCT 0089) 2.0 x 109 CFU g-1, and Pediococcus acidilactici (CCT 2553) 1.0 x 1010 CFU g-1, and L: silage inoculated with Lactobacillus plantarum (CCT 0580) 2.6 x 1010 CFU g-1 and Pediococcus pentosaceus (CCT 7659) 2.6 x 1010 CFU g-1. The experimental design was completely randomized, with five replications. There were no treatment effects on the nutritional composition of the silages, but both inoculants were effective in reducing the pH of the silage to 4.80 and 4.83 for I and L, respectively, compared with 5.04 for C. Silage with L had a lower ammonia nitrogen (N-NH3) content than the other silages (9.83%). Despite the lower pH values, the use of inoculants did not reduce fungal and yeast counts or improve the aerobic stability of Tanzania guinea grass silages.
Highlights
Cultivars of Panicum maximum Jacq. are characterized by accelerated growth and high potential for fresh matter production per unit area
The treatments evaluated were: (C) control silage with water applied in the same proportion as the other silages; (I) silage with an inoculum of Lactobacillus plantarum [CCT 0580] 8.0×109 colony forming units (CFU) g-1, Bacillus subtilis [CCT 0089] 2.0×109 CFU g-1, and Pediococcus acidilactici [CCT 2553] 1.0×1010 CFU g-1, and (L) silage with an inoculum of Lactobacillus plantarum [CCT 0580] 2.6×1010 CFU g-1 and Pediococcus pentosaceus [CCT 7659] 2.6×1010 CFU g-1
Sufficient concentrations of soluble carbohydrates are required as the fuel for lactic acid bacteria (Tomaz et al, 2018; Dong et al, 2020)
Summary
Cultivars of Panicum maximum Jacq. are characterized by accelerated growth and high potential for fresh matter production per unit area. When harvested for silage production, its apex of nutritional quality coincides with the stage where forage has low dry matter (DM) and soluble carbohydrates, and high buffer capacity (Zanine et al, 2018), which may impair fermentation and favour Clostridium (Santos et al, 2008). These characteristics affect the nutritional quality of the silage, and the aerobic stability when the silo is opened (Santos et al, 2014). In most of these studies, the inoculants contained strains of Lactobacillus buchneri and Lactobacillus plantarum, with little insight into other strains with conservative potential
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