Parâmetros de fermentação de silagens de cana-de-açúcar submetidas a diferentes tratamentos

Abstract

Parâmetros de fermentação de silagens de cana-de-açúcar submetidas a diferentes tratamentos RESUMOOs valores de materia seca (MS), pH, teores de N-NH 3 /NT, ácidos orgânicos e etanol, de silagens de cana-de-açúcar foram determinados, em delineamento experimental em blocos ao acaso. Os tratamentos aplicados à silagens foram: sem aditivo, testemunha (T); 0,5% de uréia (U); 0,5% de zeólita (Z); 0,5% de uréia mais 0,5% de zeólita (U+Z); inoculante bacteriano/enzimático Bio Max® cana (IBB) e inoculante bacteriano Silobac® (IBS). As silagens foram analisadas aos 56 dias após ensilagem. Os tratamentos U e U+Z apresentaram concentrações médias de ácido lático mais altas que o T, respectivamente 8,9 e 4,7g%. Os teores de etanol das silagens aditivadas foram semelhantes aos do tratamento T, respectivamente 12,4 e 12,9g%, sugerindo que não houve redução da fermentação alcoólica no material tratado. Com exceção da uréia, nenhum dos outros aditivos utilizados neste experimento promoveu melhoria de parâmetros qualitativos das silagens avaliadas. O efeito benéfico da uréia sobre a qualidade da silagem de cana parece ter sido limitado, não suprimindo a ocorrência do processo de fermentação alcoólica no material. Palavras-chave: cana-de-açúcar, silagem, aditivo ABSTRACT The values of dry matter (DM), pH, amoniacal nitrogen/total nitrogen (N-NH3/NT), organic acids

Effects of microbial inoculants and amino acid production by-product on fermentation and chemical composition of sugarcane silages

“…These results differ from those found by Castro Neto et al (2008), who evaluated the inoculation of sugarcane silage with Lactobacillus plantarum (Biomax 5) and observed no effects on DM, NH 3 /total N and soluble carbohydrates content, as well as no effects on lactic, acetic and butyric acids and ethanol. According to the authors, the reason for this result may have been the reduced or similar growth rate of the inoculated microorganisms in comparison with that of the native silage microbial population.…”

“…By decreasing the ethanol production, lower losses of volatile compounds will occur during the oven drying process of dry matter content determination, thereby increasing the silage DM content. Castro Neto et al (2008) evaluated the inoculation of sugarcane silages with Lactobacillus plantarum (Biomax 5) and observed that there were no effects on DM and soluble carbohydrates contents, which partially concurs with the present results. In the study of Schneider et al (1995), the inoculation of wet brewer grains silages with Lactobacillus plantarum and Streptococcus faecium did not have effects on DM, CP, NDF or ADF contents, but decreased soluble carbohydrates concentrations, which also partially agrees with the present findings.…”

“…Increments on NH 3 and pH and no alterations in ethanol levels of sugarcane silages were observed when urea was added as an additive. These results probably occurred due to the urea hydrolysis to ammonia, the uptake of hydrogen ions and due to the fact that urea did not inhibit the growth of yeast and fungi (Castro Neto et al, 2008). The addition of nitrogen sources (eg.…”

Chemical composition, fermentation profile and apparent digestibility of sugarcane silage treated with chemical additives

“…Plant cell urease converts urea applied to ensiled forages into ammonia and the additive applied at the dose of 5.0 g/kg FF resulted in reductions in yeast counts, lower ethanol content and DM losses and higher digestibility in sugarcane silages of previous experiments CAstro Neto et al, 2008;2008). Higher doses of urea may result in inadequate pH and higher DM losses in the silage (siqueirA et al, 2010).…”

Composição bromatológica e dinâmica de fermentação da silagem de jaca

“…Valor Neto et al (2008), que também observaram aumentos nos teores de N-NH 3 e PB quando foi utilizada uréia como aditivo na ensilagem de cana-de-açúcar.…”