When added to the diet of sheep, 2 g/d, Aspergillus oryzae fermentation extract (AO) stimulated total and cellulolytic bacterial numbers in rumen fluid by 34 and 90% respectively. AO had no effect on the numbers of protozoa or fungal zoospores. AO did not affect hydrogen production by the rumen fungi Neocallimastix frontalis (RE1), N. patriciarum (CX) or Piromonas communis (P) in pure culture or protozoal activity in vitro, estimated from the rate of breakdown of [C] leucine-labelled Selenomonas ruminantium. It was concluded that increases in ruminal fibre digestion observed previously in animals fed AO, were most likely due to a stimulation of bacteria rather than eukaryotes in the rumen microbial population.
|Number of pages||4|
|Journal||Letters in Applied Microbiology|
|Publication status||Published - Sep 1992|