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Effects of grass species on ruminal degradability of silages and prediction of dry matter effective degradability

Author

Listed:
  • F. Jančík

    (Institute of Animal Science, Prague-Uhříněves, Czech Republic)

  • V. Koukolová

    (Institute of Animal Science, Prague-Uhříněves, Czech Republic)

  • P. Kubelková

    (Institute of Animal Science, Prague-Uhříněves, Czech Republic)

  • B. Čermák

    (Faculty of Agriculture, University of South Bohemia in České Budějovice, České Budějovice, Czech Republic)

Abstract

Forty samples of grass silages, made from the five most widely used grass species in ruminant nutrition (Dactylis glomerata L.,Phleum pratense L., Lolium perenne L., Festuca arundinacea L. and hybrid Felina) were tested in the present study. These grass species conserved by an ensiling process were compared among each other according to dry matter (DM) rumen degradability parameters (a = portion of DM solubilized at initiation of incubation, b = fraction of DM potentially degradable in the rumen, c = rate constant of disappearance of fraction b and EDDM = effective degradability of DM, estimated for each ingredient assuming the rumen solid outflow rates of 0.02 (EDDM2), 0.05 (EDDM5) and 0.08 (EDDM8) h-1). Based on the chemical composition of grass silages the regression equations for prediction of EDDM were evaluated. The influence of the ensiling process on dry matter degradability parameters was also assessed. The best values of EDDM were determined for Lolium perenne (EDDM2 = 753.2, EDDM5 = 631.1 and EDDM8 = 567.7 g/kg DM). The best predictor was NDF (R2-values of 0.757 (EDDM2), 0.863 (EDDM5) and 0.906 (EDDM8)). Using two predictors the accuracy level increased. The combination of CF and NDF gave R2-values 0.892, 0.920 and 0.929 for EDDM2, EDDM5 and EDDM8, respectively. The regression equations based on the most important grass species harvested in different vegetation periods seem to be a useful tool for practical use. No significant P < 0.05) effect of the ensiling process in relation to dry matter rumen degradability parameters was proved.

Suggested Citation

  • F. Jančík & V. Koukolová & P. Kubelková & B. Čermák, 2009. "Effects of grass species on ruminal degradability of silages and prediction of dry matter effective degradability," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 54(7), pages 315-323.
    • Handle: RePEc:caa:jnlcjs:v:54:y:2009:i:7:id:1725-cjas
    DOI: 10.17221/1725-CJAS
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    References listed on IDEAS

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    1. P. Homolka & J. Harazim & J. Třináctý, 2007. "Nitrogen degradability and intestinal digestibility of rumen undegraded protein in rapeseed, rapeseed meal and extracted rapeseed meal," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 52(11), pages 378-386.
    2. P. Homolka & V. Koukolová & Z. Němec & Z. Mudřík & B. Hučko & J. Sales, 2008. "Amino acid contents and intestinal digestibility of lucerne in ruminants as influenced by growth stage," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 53(12), pages 499-505.
    3. A. Kamalak & O. Canbolat & Y. Gurbuz & O. Ozay, 2005. "Comparison of in vitro gas production technique with in situ nylon bag technique to estimate dry matter degradation," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 50(2), pages 60-67.
    4. F. Jančík & P. Homolka & B. Čermák & F. Lád, 2008. "Determination of indigestible neutral detergent fibre contents of grasses and its prediction from chemical composition," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 53(3), pages 128-135.
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