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p-Coumaric acid (PCA) and ferulic acid (FA) inhibit cellulose digestion in vitro, whereas PCA stimulates hemicellulose degradation. Acid concentrations increase in tall fescue during maturation but remain stable in alfalfa. Hemicellulose and cellulose digestion by sheep is associated with phenolic acid content of tall fescue but not of alfalfa.
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Jung et al. (1984) studied this question.
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