Ensilagem e fenaÃÃo do bagaÃo de cana-de-aÃÃcar proveniente da produÃÃo de cachaÃa / Ensiling and hay-making of sugar-cane bagasse coming from rum production.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Use of sugar cane bagasse and cane tip generated in stills enables to the producer the integration of rum production with ruminant breeding. The adequate storage of bagasse can contribute towards the maintenance of its unaltered characteristics for long periods. With the objective of evaluating sugar cane bagasse (BC) coming from still rum production submitted to different forms of conservation, four trials were conducted at the Federal University of Lavras (Universidade Federal de Lavras). In the first, in natura BC, whole ensiled BC, chopped ensiled BC, BC hayed and baled manually, BC hayed and baled mechanically, in natura BC hayed manually, in natura BC hayed and baled mechanically were evaluated. The bromatologic composition (DM, CP, ash, NDF, ADF, cellulose, hemicellulose and lignin), buffer capacity (BC) and pH was determined. The form of conservation of bagasse influenced significantly the bromatologic composition, except fro lignin. Sugar cane bagasse showed low BC and the silages presented pH satisfactory for good conservation. Dehydration followed by hand baling provided decrease in the cell wall components, revealing itself the best method of bagasse conservation. In the second trial, both bagasse and bagasse silages were evaluated with four doses of urea, molasses, milk powder scraps, cheese whey and cane top. The ensiling process promoted reduction in the contents of DM, cellulose and hemicellulose. The silages with cane top presented the greatest DM losses and the silages with molasses, scrap, whey and cane top presented reduced content of CP relative to the original matter. Doses above 0.66% of urea provided silages with a CP content higher than 6%. All the silages showed low ash contents. The contents of NDF were not altered with the bagasse silage with urea and molasses and ere reduced with scrap, whey and cane top. ADF content was reduced in the silages with scrap, whey and cane top, it was kept with molasses and increased with urea. The silages with cane top presented the lowest average ADF and lignin content. The bagasse BC was low and pH values in the silages inferior to 3.88. In the third trial, pure bagasse silages or added of 1% of urea, 4% of molasses, 3% of scrap, 10% of whey, 15% of cane top and with the association of 1% of urea and 4% of molasses were evaluated as to in situ degradability of DM. The values of the soluble fraction (a), potentially degradable insoluble fraction (b), degradation rate of fraction b (c), effective and potential degradability and undegradable fraction of DM. Passage rate adopted was of 5%/hour. The silage produced with the association of 1% of urea and 4% of molasses presented the highest soluble fraction (24.44%) and highest effective degradability of DM (32.39%). The silages did not differ as for fractions âbâ, âcâ, potential degradability and undegradable fraction. In the fourth trial, bagasse was ensiled with the combination of four doses of urea (0; 0.5; 1.0 and 1.5% in FM) with four doses of molasses (0, 2, 4 and 6% in FM). The original material and silages were evaluated as regards the bromatologic composition, BC and pH. There was an effect of the interaction urea and molasses in the contents of DM, CP, ash, ADF, cellulose, hemicellulose, lignin, BC and pH, in the original material and cane bagasse silages. There was an effect of the interaction urea and molasses in the NDF content in the material before ensiling, but not in the NDF content in the silages. The values recorded for BC in the bagassse were low and the silages presented pH inferior to 4.2. The silages produced with the addition of 4 or 6% of molasses showed DM contents inferior to 41%. Addition of 1% of urea provided silages with a CP content superior to 7% in DM, promoted reduction in the contents of NDF, ADF, hemicellulose and lignin. Molasses at the dose of 4% provided reduction in the contents of CP, NDF, hemicellulose and lignin in silage. The association of 1% of urea and 4% of molasses is advisable for obtaining high quality bagasse silages.

ASSUNTO(S)

zootecnia feno; silagem; sub-produto by-product; hay; silage

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