Effects of aeration or water soluble carbohydrates on sugarcane silage / Efeitos da aeração ou do teor de carboidratos solúveis sobre as características da silagem de cana-de-açúcar

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

This trial aimed at evaluating the effects of aeration time or contents of water-soluble carbohydrate on nutritive value and other fermentative characteristics of sugarcane silage.Two experiments was used in a completely randomized design with three treatments and four repetitions per treatment, the material was ensiled in 12 laboratory silos (6 liter-capacity plastic buckets). In experiment I fresh chopped sugarcane was exposed to aeration for 0, 4 or 8 hours, and ensiled soon after. In experiment II sugarcane was squeezed in order to remove juice. In the first treatment, juice was totally added back to sugarcane (100%). In the second treatment, only 50% of the juice were added back to sugarcane, along with 50% of water. In the third, 100% of water were added, with no addition of juice. Silos were opened 85 days after ensiling, when organic acids contents and chemical composition of silages were determined. In first experiment deviation of linearity (P<0.05) was observed for aeration time on dry matter content. Positive linear effect was observed (P<0.05) on ADF, NDF and soluble carbohydrates content, but negative for in vitro digestibility of dry matter. For organic acids content, deviation of linearity (P<0,05) was observed on acetic acid, with the lowest content (1.5% of DM) observed after 8 hours of aeration, and negative linear effect (P<0,05)was observed for lactic and butyric acids, as well as for pH values. There were no effects on ethanol concentration, which remained very high (22% of DM), independent on the aeration time. Aerobic stability of silage worsened with the increase of aeration time. In second experiment, withdrawal of sugarcane WSC resulted in negative linear effects (P<0,05) on dry matter, soluble carbohydrate contents and on in vitro digestibility of dry matter, but with linear increase for ADF, NDF and lignin contents. About fermentation data, there was linear decrease for dry matter losses, lactic and butyric acids and ethanol contents. Positive linear effects (P,0,05) were observed on pH values and ammoniacal nitrogen and acetic acid contents. Data from aerobic stability were inconclusive Ethanol production would be null if sugarcane had only 12.4% of water-soluble carbohydrates on dry matter basis.

ASSUNTO(S)

fermentação fermentation carboidratos solúveis aeração silagem cana-de-açúcar silage aeration nutririve value sugarcane soluble carbohydrates valor nutritivo

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