Frações dos compostos nitrogenados associados à parede celular em forragens tropicais Fractions of cell wall nitrogenous compounds in tropical forages

The total and undegradable fractions of nitrogenous compounds associated to cell wall organic matrix in some tropical forages were evaluated. Samples of corn silage, elephantgrass silage and sugarcane were used. Neutral detergent insoluble nitrogenous compounds were divided in three different fracti...

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Bibliographic Details
Published in:Arquivo brasileiro de medicina veterinária e zootecnia 2007-02, Vol.59 (1), p.258-263
Main Authors: L.T. Henriques, E. Detmann, A.C. Queiroz, S.C. Valadares Filho, M.I. Leão, M.F. Paulino
Format: Article
Language:English
Subjects:
degradability
degradação ruminal
insoluble protein
lignin
lignina
proteína insolúvel em detergente neutro
proteína insolúvel em detergente ácido
rumen
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Summary:The total and undegradable fractions of nitrogenous compounds associated to cell wall organic matrix in some tropical forages were evaluated. Samples of corn silage, elephantgrass silage and sugarcane were used. Neutral detergent insoluble nitrogenous compounds were divided in three different fractions associated with: hemicellulose (HN), cellulose (CN), and lignin (LN). The size of the different fractions varied among feeds. A portion of acid detergent insoluble nitrogen, which is the sum of CN and LN, was potentially degradable in the rumen. A portion of HN was not degradable in the rumen. The heterogeneous dimensions of degradable portion of all nitrogenous compounds among feeds can compromise the estimates of cell wall undegradable nitrogen by simple chemical approaches in tropical forages. The LN overestimated the lignin contents and the correction for those compounds on lignin has been suggested.
ISSN:0102-0935
1678-4162
DOI:10.1590/S0102-09352007000100043