Abstract
A total of 20 fungal cultures were isolated from the rumen of cattle fed a high fibre-containing diet. All of the isolates showed polycentric growth patterns and were identified as different strains of Orpinomyces and Anaeromyces. Enzyme assays of most of the isolates showed the highest carboxymethylcellulase (CMCase) and xylanase activities after 96 h of growth and highest avicelase activity after 120 h. Among all enzymes tested, xylanase activity was the highest, followed by CMCase and avicelase. The results of the in vitro fibre digestibility and rumen fermentation analyses revealed that the addition of fungal cultures significantly increased acetate, in vitro dry matter digestibility, partition factor values and microbial biomass synthesis levels. Overall, Orpinomyces spp. were found to be the better enzyme producers and fibre degraders than Anaeromyces spp.
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