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Feruloyl- and Para-Coumaroyl-Carbohydrate Esters from Grass and Cellulose Degradation by Ruminal Microorganisms

Richard B. Russell Agric. Res. Center, USDA-ARS P.O. Box 5677, Athens, GA 30613.

^* Corresponding author.

Phenolic compounds are a primary limitation to forage digestibility, but the specific mechanism that limits microbial activity requires elucidation. The objective of this research was to determine the influence of phenolic acid-carbohydrate esters isolated from ‘Coastal’ bermudagrass (Cynodon dactylon L. Pers.) on cellulolysis by rumen microorganisms. One or 5mM concentrations of 0-[5-0-(trans-feruloyl)--L-arabinofuranosyl]- (13)]-0-ß-D-xylopyranosyl- (14)-D-xylopyranose (FAXX), 1 mM 0-[5-0-(trans-p-coumaroyl)--L-arabinofuranosyl]-(13)-0-ß-D-xylopyranosyl-( 14)-D-xylopyranoses(PAXX), equivalent concentrations of free phenolic acids and equivalent concentrations of L-arabinose plus D-xylose were added to anaerobic incubation vials containing MN 300 cellulose. Inhibition of cellulolysis by about 24% in the 5 mM study appeared to be due to the sugars and not the phenolic moiety. These studies suggest that these free phenolic-carbohydrate esters have minimal effect on fiber-digesting microorganisms in the rumen.

Received for publication July 8, 1991.