Digestibility of silages in relation to their hydroxycinnamic acid content and lignin composition |
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Authors: | Alfredo Taboada Esther Novo‐Uzal Gonzalo Flores Maria Loureda Alfonso Ros Barceló Antón Masa Federico Pomar |
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Affiliation: | 1. CIA de Mabegondo‐INGACAL, E‐15080 A Coru?a, Spain;2. Department of Animal Biology, Plant Biology and Ecology, University of A Coru?a, E‐15071 A Coru?a, Spain;3. Department of Plant Biology, University of Murcia, E‐30100 Murcia, Spain;4. Misión Biológica de Galicia, Consejo Superior de Investigaciones Científicas (CSIC), E‐36080 Pontevedra, Spain |
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Abstract: | 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 R2 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 R2 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. Copyright © 2010 Society of Chemical Industry |
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Keywords: | cell wall hydroxycinnamic in vivo digestibility lignin |
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