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E. A. Burritt, J. C. Malechek, F. D. Provenza, Changes in Concentrations of Tannins, Total Phenolics, Crude Protein, and in vitro Digestibility of Browse Due to Mastication and Insalivation by Cattle, Journal of Range Management, Vol. 40, No. 5 (Sep., 1987), pp. 409-411
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Burritt et al. (1987) studied this question.
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