Czech J. Anim. Sci., 2005, 50(7):320-328 | DOI: 10.17221/4173-CJAS

In sacco NDF degradability and mineral release from selected forages in the rumen

Z. Čerešňáková, P. Fľak, M. Poláčiková, M. Chrenková
Research Institute of Animal Production, Nitra, Slovak Republic

An in sacco technique was used to measure NDF degradability and release of Mg, Ca, Zn, Cu, Fe from six forages - lucerne hay from the 1st cut (LH1), from the 2nd cut (LH2), orchard grass (G), grass silage (GS), red clover silage treated with Feedtech (CSFT) and/or with Kofasil (CSKO). The forages differed in the content of NDF and minerals. There were large differences (P < 0.01) in element release in the rumen between experimental forages and the particular elements. The rate of release of elements was higher from LH1, LH2, CSFT,CSKO than from G and GS. The release of individual elements and NDF over all incubation times is very well expressed by cubic polynomials (R2> 0.9). Overall, across forages the release of mineral elements ranked as follows: Mg > Fe > Cu > Ca > Zn. The minimum and maximum disappeared portions of individual minerals from forages are as follows: Mg 74.7% from G and > 91.5% from LH1, Fe 29.7% from G and 99.9% from LH1 and LH2, Cu 64.3% from G and 99.8% from LH1 and LH2, Ca 28.4% from G and 75.4% from CSFT, Zn 12.0% from G and 38.2% from LH1, respectively. Calcium and zinc need a longer time for their maximum release. It can be concluded from the results of multiple regression analyses that only the Mg and Ca release is associated depending on NDF and time of observations, with a highly significant influence of forage on Zn and Cu.

Keywords: forage; NDF; mineral element release; rumen; in saccometod

Published: July 31, 2005  Show citation

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Čerešňáková Z, Fľak P, Poláčiková M, Chrenková M. In sacco NDF degradability and mineral release from selected forages in the rumen. Czech J. Anim. Sci. 2005;50(7):320-328. doi: 10.17221/4173-CJAS.
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