In vitro and in vivo fermentation of glycerol by rumen microbes

摘要: Abstract Four rumen-fistulated cows, fed maize silage (n = 2) or hay 2), were administered glycerol (240 g and then 1200 dry matter (DM)) daily through the cannula, after a control period. In vitro fermentations (five six per cow, two of which carried out during period) showed that ability rumen liquid to degrade increased with amount was slightly higher when samples came from cows silage. Microbial adaptation seemed immediate, as maximal rate degradation achieved on first day. The relative proportions propionic (C3) butyric (C4) acids in volatile fatty acid (VFA) mixture fermenter fluid at expense acetic (C2). vivo, 240 480 days measurements had disappeared all but one occasion 4 h afterwards. VFA, proportion C4, and, lesser extent, C3, increased. absorbed transformed into C3 amounted 35–69% g), according disappearance used computations.