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Substitution of crude cell wall for neutral detergent fibre in the equations of the Cornell Net Carbohydrate and Protein System that predict carbohydrate fractions: application to sunflower (Helianthus annuus L.)

Published online by Cambridge University Press:  01 July 2008

M. A. A. Queiroz ,
R. S. Fukushima ,
C. A. Gomide  and
M. R. Braga
M. A. A. Queiroz
Affiliation:
Escola Superior de Agricultura ‘Luiz de Queiroz’, Universidade de São Paulo, Piracicaba, SP, Brazil
R. S. Fukushima*
Affiliation:
Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Av. Duque de Caxias-Norte, 225, CEP: 13635-900, Pirassununga, SP, Brazil
C. A. Gomide
Affiliation:
Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, SP, Brazil
M. R. Braga
Affiliation:
Instituto de Botânica, Secretaria de Estado do Meio Ambiente, São Paulo, SP, Brazil
*
E-mail: rsfukush@usp.br
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Abstract

Prediction of carbohydrate fractions using equations from the Cornell Net Carbohydrate and Protein System (CNCPS) is a valuable tool to assess the nutritional value of forages. In this paper, these carbohydrate fractions were predicted using data from three sunflower (Helianthus annuus L.) cultivars, fresh or as silage. The CNCPS equations for fractions B2 and C include measurement of ash and protein-free neutral detergent fibre (NDF) as one of their components. However, NDF lacks pectin and other non-starch polysaccharides that are found in the cell wall (CW) matrix, so this work compared the use of a crude CW preparation instead of NDF in the CNCPS equations. There were no differences in the estimates of fractions B1 and C when CW replaced NDF; however, there were differences in fractions A and B2. Some of the CNCPS equations could be simplified when using CW instead of NDF. Notably, lignin could be expressed as a proportion of DM, rather than on the basis of ash and protein-free NDF, when predicting CNCPS fraction C. The CNCPS fraction B1 (starch + pectin) values were lower than pectin determined through wet chemistry. This finding, along with the results obtained by the substitution of CW for NDF in the CNCPS equations, suggests that pectin was not part of fraction B1 but present in fraction A. We suggest that pectin and other non-starch polysaccharides that are dissolved by the neutral detergent solution be allocated to a specific fraction (B2) and that another fraction (B3) be adopted for the digestible cell wall carbohydrates.

Keywords

indigestible cell wallligninpectinsoluble fibrestarch
Type
Full Paper
Information
animal , Volume 2 , Issue 7 , July 2008 , pp. 1087 - 1092
Copyright
Copyright © The Animal Consortium 2008

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