In sacco macromineral release from selected forages
Ceresnakova, Z.,Vyskumny Ustav Zivocisnej Vyroby, Nitra (Slovak Republic) | Flak, P.,Vyskumny Ustav Zivocisnej Vyroby, Nitra (Slovak Republic) | Polacikova, M.,Vyskumny Ustav Zivocisnej Vyroby, Nitra (Slovak Republic) | Chrenkova, M.,Vyskumny Ustav Zivocisnej Vyroby, Nitra (Slovak Republic)
An in sacco technique was used to measure the release of Mg, Ca, Na and K from six forages − lucerne hay from the 1st and 2nd cut (LH1 and LH2), orchard grass hybrids Rela (GR) and Niva (GN), grass silage (GS), red clover silage treated with Feedtech (CSFT) and/or treated with Kofasil (CSKO). The forages differed in the content of macrominerals (Ca 3.66-15.82 g/kg DM; Mg 1.46-3.68 g/kg DM; Na 0.20-3.02 g/kg DM; K 21.57-34.79 g/kg DM). Large differences (P less than 0.01) were also observed in the element release in the rumen. Forages from legumes had higher DM effective degradability (62.9%-67.1%) than grass forages 49.5%-51.5%. The extent of disappearance of macroelements was also higher from LH1, CSFT, CSKO than from G and GS. The release of individual elements in all incubation times could be expressed very well by cubic polynomials. The maximum portions of the minerals which disappeared from forages were as follows: Ca 86.3% and Mg 93.2% from CSFT, Na 98.7% from GN and K less than 98% from all feeds. Potassium solubility was rapid and not affected by the incubation time.
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