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Condensed tannin-amended cassava silage: fermentation characteristics, degradation kinetics and in-vitro gas production with rumen liquor

  • T. V. C. Nascimento (a1), L. R. Bezerra (a2), D. R. Menezes (a3), A. R. F. Lucena (a3), M. A. Á. Queiroz (a3), J. S. Trajano (a1) and R. L. Oliveira (a1)...


The objective of the current research was to evaluate the fermentative characteristics of silage made with the upper third section of cassava (Manihot esculenta) plants with added condensed tannin levels of 0, 25, 50 and 75 g/kg dry matter (DM). The experimental design was a complete randomized design, with treatments arranged in a 4 × 7 factorial (tannin addition levels × days of ensiling). The loss of gas and the presence of moulds observed in the opening days had increased linearly. Fermentative characteristics were decreased by the addition of tannin. Acetic acid content showed a linear increase. Tannin levels had a quadratic effect on gas production at 28 days of ensiling. After 56 days, however, tannin levels had no significant effect on silage gas production. After 28 days of ensiling, the degradability of potentially degradable fraction ‘b’ demonstrated quadratic effect. The same occurred with the fractions ‘a’, ‘b’ which were undegradable after 56 days of ensiling. The addition of condensed tannin lengthened the fermentative stage and caused the silage to stabilize after 56 days of ensiling.


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Author for correspondence: R. L. Oliveira, E-mail:


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