Aditivos químico e microbiano na ensilagem de mucilagem de sisal

Abstract

Mucilage is one of the residues of the sisal industry that can be used as a bulky food source for ruminants. An alternative to optimize the use of this residue and guarantee food throughout the year is the conservation of this material, which can be made in the form of hay or silage. The objective of this study was to evaluate the effects of the addition of urea and / or Lactobacillus plantarum on the quality of sisal mucilage silage (Agave sisalana, Perrine). The initial part of the experiment was carried out in the forage sector of the Federal University of the Recôncavo da Bahia, where the ensiling was carried out. The analyzes were carried out in the Laboratory of Food Analysis of the UFRB, among them, the chemical-bromatological composition and the fermentation characteristics. Loss quantification and aerobic stability assessment were also performed. The silages were prepared in experimental mini-silos, using a completely randomized design in a 5x2 factorial scheme, five levels of urea: 0%; 0,5%; 1,0%; 2,0% and 4,0% in dry matter, with and without L. plantarum, with five replicates. Addition of urea implied an increase in the crude protein content, proportional to the increase of the added urea contents, and the silages that received the urea associated inoculant resulted in even higher averages. There was no interaction between the additives (P> 0.05) for the soluble carbohydrate data and the mean values were around 8%. Regarding the total losses, the silages that did not receive additives presented the highest averages. The silages added with 2,0% and 4,0% of urea with L. plantarum showed the lowest losses due to effluents. The pH values of the silages were around 4,4 and 6,4 and the buffer capacity was between 23,53 and 46,26 emg HCl / 100 g dry matter. In relation to the maximum temperature reached by the silages after the opening time of the silos, it can be observed that the additives with 2,0% and 4,0% of urea associated to L. plantarum were those that presented lower temperature. The greatest amplitude between the temperatures was of the silage that did not receive additives, and the smaller differences between the temperatures were observed in the silages that received 2,0 and 4,0% of urea with addition of the inoculant. The silages that received 2,0% and 4,0% of urea with L. plantarum were those that remained longer in aerobic stability. The interaction between urea and L. plantarum in sisal mucilage silage were effective in reducing losses and were efficient in increasing the useful life of sisal mucilage silage.