| Sumario: | The objective of the present study was to evaluate the effect of calcium propionate
(CaPr) on in vitro ruminal fermentation using a factorial arrangement 2 x 2 evaluating
CaPr (0 vs. 1%) and grain level (55 vs. 65%). There was a CaPr x Grain interaction in
the volume of gas produced (V; p = 0.04). Addition of CaPr prolonged Lag time (1.4 vs.
1.04 h; P<0.01), and increasing the grain level also prolonged Lag time (1.56 vs. 0.89 h;
p < 0.03) and gas production rate (0.046 vs. 0.041 h-1; P<0.04). However, there were no
differences in CH4, CO2, acetate, propionate and butyrate concentrations. Therefore, the
addition of calcium propionate in a diet with 55 or 66% of grain increased Lag phase but
it is not affected fermentation pattern or methane losses.
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