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Journal of Dairy Science Vol. 47 No. 12 1365-1370
© 1964 by American Dairy Science Association ®
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Dietary Induced Changes in Volatile Fatty Acid Formation from {alpha}-Cellulose-C14 and Hemicellulose-C14

L. D. Satter, J. W. Suttie and B. R. Raumgardt

Departments of Dairy Science and Biochemistry, University of Wisconsin, Madison1,2,

ABSTRACT

The effect of dietary changes and associative changes in ruminal microorganisms on volatile fatty acid (VFA) formation from C14-labeled polysaccharides was investigated. Cellulose-C14 and hemicellulose-C14, isolated from orchard grass grown under a C14O2 atmosphere, were incubated 4 hr with rumen ingesta obtained from a fistulated cow fed either alfalfa hay (H) or a 2.5:1 grain-alfalfa hay mixture (G). With cellulose-C14 as the substrate, the molar acetate-C14:propionate-C14 ratio with ingesta H was significantly greater (P < .01) than with ingesta G (3.6 and 2.1, respectively). Comparable ratios with hemicellulose-C14 were also significantly greater (P < .01) with ingesta H than with ingesta G (3.0 and 2.4, respectively). These data suggest that the lower acetate:propionate ratios frequently observed on high-grain diets are due not only to the fermentation of more soluble carbohydrate but that the fermentation pattern of cellulose and hemicellulose also may be altered. The percentage of propionate-C14 formed by way of the randomizing route, involving a four-carbon intermediate which is subsequently decarboxylated, ranged from 92% for ingesta H with cellulose to 77% for ingesta G with hemicellulose. There was an indication that the randomizing route of propionate formation was more important with ingesta H than with ingesta G.

FOOTNOTES

1 Published with the approval of the Director of the Wisconsin Agricultural Experiment Station.

2 This work was supported in part by the Research Committee of the Graduate School from funds supplied by the Wisconsin Alumni Research Foundation.






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