Digestibility of silages in relation to their hydroxycinnamic acid content and lignin composition

作者：Taboada Alfredo; Novo Uzal Esther; Flores Gonzalo; Loureda Maria; Ros Barcelo Alfonso; Masa Anton; Pomar Federico^*

来源：Journal of the Science of Food and Agriculture, 2010, 90(7): 1155-1162.

DOI：10.1002/jsfa.3933

• cell wall
• hydroxycinnamic
• in vivo digestibility
• lignin

BACKGROUND: The effectiveness of the analysis of cell wall-bound hydroxycinnamic acids and the composition of lignin to evaluate the in vivo digestibility of a silage collection with unknown botanical composition was evaluated.
RESULTS: Syringyl units content and total etherified phenols showed the highest correlation coefficients with in vivo dry matter digestibility (IVDMD) (r = -0.792 and r = -0.703, respectively), while guaiacyl units and total phenols showed the highest correlation coefficients with in vivo organic matter digestibility (IVOMD) (r = -0.871 and r = -0.817, respectively). Using the above-mentioned chemical parameters, 10 equations were also developed to predict in vivo digestibility. The prediction of IVDMD produced a high adjusted R-2 value (0.710) using syringyl, total lignin, etherified total phenols, esterified ferulic acid and total phenol content as predictors. The prediction of IVOMD produced a higher adjusted R-2 value (0.821) using guaiacyl, total phenols, total ferulic acid and etherified p-coumaric acid content as predictors.
CONCLUSION: Cell wall digestibility depends on a multiplicity of factors and it is not possible to attribute a causal effect on in vivo digestibility to any single factor. However, syringyl and guaiacyl content and etherified phenols emerge as good predictors of digestibility.

• 出版日期2010-5