degradabilidade in situ e observações microscópicas de volumosos em bovinos suplementados com enzimas fibrolíticas exógenas in situ degradability and microscopical observations of roughages in cattle supplemented with exogenous fibrolytic enzymes

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ID: 249219
2007
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Abstract
Avaliou-se o efeito de enzimas fibrolíticas (celulase e xilanase) sobre a degradabilidade in situ da MS, PB, FDN, FDA e hemicelulose do feno de Tifton-85 (Cynodon spp.) cortado aos 30 e 90 dias e do bagaço de cana, utilizando-se seis bovinos com cânula no rúmen. As enzimas foram extraídas dos fungos Aspergillus niger e Trichoderma longibrachiatum e fornecidas, na quantidade de 0,75 g/kgMS.dia, por meio da cânula ruminal. Os tempos de incubação ruminal foram de 0, 3, 6, 12, 24, 48, 72 e 96 horas. Os resíduos de incubação foram avaliados por meio de microscopia eletrônica de varredura (MEV). O efeito da adição de enzimas sobre a degradação da MS e PB variou em função do volumoso estudado. A degradabilidade efetiva da MS do feno Tifton cortado aos 30 e 90 dias e do bagaço de cana sem a adição de enzimas foi de 61,85; 42,35 e 28,22%, respectivamente, e de 63,51; 40,64 e 31,43%, respectivamente, com a adição das enzimas. Não houve efeito das enzimas sobre a degradação da fibra. As observações ao MEV indicaram aumento da colonização bacteriana sobre a parede celular com a suplementação enzimática. A adição de enzimas fibrolíticas na dieta de ruminantes apresentou efeito pouco expressivo sobre os parâmetros de degradação ruminal dos volumosos estudados.
The effect of fibrolytic enzymes addition (cellulase and xylanase) on the DM, CP, NDF, ADF, and hemicellulose in situ degradability of Tifton 85 hay (Cynodon spp.) cut at 30 and 90 days and sugarcane bagasse were evaluated with six bovines cannulated on the rumen. The enzymes were extracted from Aspergillus niger and Trichoderma longibrachiatum fungi and supplied 0.75 g/kg of DM/animal.day, through ruminal cannula. The incubation times were 0, 3, 6, 12, 24, 48, 72, and 96 hours. The incubation residues were compared by scanning electron micrographs (SEM). The effect of enzyme addition on the DM and CP degradation varied in function of roughage studied. The effective degradability of DM of Tifton 85 hay cut at 30 and 90 days and sugarcane bagasse, without enzymes addition, was 61.85, 42.35, and 28.22%, respectively, and 63.51, 40.64, and 31.43%, respectively, with enzymes addition. There was no effect of enzymes on the fiber degradation. The SEM observations showed that bacterial colonization increased on the cell wall of roughages with enzymatic supplementation. The fibrolytic enzyme addition to the ruminant diet presented little expressive effect on the degradation parameters of studied roughages.
Reference Key
martins2007revistadegradabilidade Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Adriana de Souza Martins;Paulo de Figueiredo Vieira;Telma Teresinha Berchielli;Ivanor Nunes do Prado;Beatriz Lempp;Meiby Carneiro de Paula
Journal european journal of lipid science and technology
Year 2007
DOI
10.1590/S1516-35982007000800029
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982007000800029
Keywords
cellulase fiber celulase fibra

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