Inoculante microbiano e torta de algodão na ensilagem de milheto em diferentes períodos de fermentação

Abstract

An experiment was carried out in the Forage sector of the Department of Zootechnics of the Agricultural Sciences Center of the Federal University of Paraíba, in Areia with the objective of evaluating the result of the addition of microbial inoculant and cotton cake on the fermentation profile, microbial populations, stability aerobic, chemical composition and losses in millet silages. The experimental design used was completely randomized, in a 4 × 2 factorial scheme, with the treatments being: 1. Control (Millet); 2. Millet + 10% cotton cake (based on natural material); 3.Millet + Weissella cibaria - heterofermentative lactic bacteria; 4. Millet + cotton cake and Weissella cibaria (Combo) and two opening periods (30 and 90 days after silage) and four repetitions, totaling 32 experimental units. Quantification of microbial populations, fermentation profile, gas losses were evaluated and effluents in silage, dry matter recovery, chemical composition and aerobic stability. The silages containing cotton cake had a greater recovery of dry matter (P = 0.0002). There was an effect of the opening on the pH of the silages (p <0.0001). At 90 days of opening, in cake silages, yeast and mold counts were less than 1.00 log UFC g-1 of silage. There was an effect of the opening in the counts of BAL, mold and yeast (p <0.0001) and silages opened at 90 days had lower counts. There was also an effect of the opening on aerobic stability (p <0.0001) in which silages opened at 90 days, there was the greatest stability. The addition of cotton cake provided an increase in the contents of DM, MM, EE, and PB (p <0.0001) and a decrease in the contents of NDF and FDA (p <0.0001), when compared to control silages (only millet). ) and inoculated with Weissellacibaria. The losses due to effluents were much lower in silages containing cotton cake. The use of cotton cake in millet silage proved to be efficient in decreasing silage losses, improving the fermentative profile and nutritional value, however, it did not influence the aerobic stability of millet silage, as well as Weissella cibaria.