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Relationship between hydroxycinnamic acid content, lignin composition and digestibility of maize silages in sheep
Authors:Novo-Uzal Esther  Taboada Alfredo  Rivera Antonio  Flores Gonzalo  Barceló Alfonso Ros  Masa Antón  Pomar Federico
Institution:Department of Animal Biology, Plant Biology and Ecology, University of A Coru?a, A Coru?a, Spain.
Abstract:Cell wall-bound hydroxycinnamic acids and the composition of lignin were studied in relation to the digestibility of a collection of 91 maize silages in wethers. Total lignin and guaiacyl content showed the highest correlation coefficients with digestibility. Using the above-mentioned chemical parameters, eight equations were also developed to predict digestibility. The prediction of organic matter digestibility produced a high adjusted R2 value (0.487) using total lignin, guaiacyl, esterified ferulic acid and esterified p-coumaric acid content as predictors. The prediction of in vivo dry matter digestibility produced a higher adjusted R2 value (0.516) using the same variables as predictors. 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, total lignin, guaiacyl and p-coumaric acid content emerge as good predictors of digestibility.
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