Effect of condensed tannin on in vitro ruminal fermentation of purple prairie clover (Dalea purpurea Vent)-cool season grass mixture.

Jin, L., Wang, Y., Iwaasa, A.D., Xu, Z., Schellenberg, M.P., Zhang, Y.G., and McAllister, T.A. (2013). "Effect of condensed tannin on in vitro ruminal fermentation of purple prairie clover (Dalea purpurea Vent)-cool season grass mixture.", Canadian Journal of Animal Science, 93(1), pp. 155-158. doi : 10.4141/CJAS2012-109  Access to full text

Abstract

Four purple prairie clover [Dalea purpurea Vent (PPC)]–/grass mixtures containing 7.3, 14.0, 29.3 and 42.1 g kg1 dry matter (DM) of condensed tannin (CT) were incubated with rumen fluid. As the CT increased, in vitro true dry matter disappearance (IVTDMD), production of volatile fatty acids (VFA) and microbial protein synthesis were linearly increased (P<0.05) at 12 h, and IVTDMD and VFA were quadratically increased (P<0.01) at 48-h incubation. Molar proportion of acetate was linearly increased (P<0.01) but propionate and butyrate were decreased (P<0.05) at both 12 and 48-h incubation. Incorporation of PPC into cool-season grass pasture up to CT content of 42 g kg1 DM improved ruminal fermentability and microbial protein synthesis in mixed forages.

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