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Journal of Dairy Science Vol. 40 No. 4 356-362
© 1957 by American Dairy Science Association ®
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Effect of Feeding Certain Silages on the Relative Concentrations of Rumen Volatile Fatty Acids1

J. M. Elliot, E. Bennett and J. G. Archibald

Departments of Dairy and Animal Science and Experiment Station Chemistry, University of Massachusetts, Amherst

ABSTRACT

In recent years considerable interest has been focused on the rumen fatty acids, their importance as a source of energy for the ruminant, and their possible implication in bovine ketosis. Since the various acids present have different energy values, information on factors affecting their relative concentration in the rumen is of considerable importance.

A number of investigators have shown that the relative concentrations of rumen volatile fatty acids may be affected by the diet. Tyznik and Allen (8), for example, reported a relative increase in propionic acid production and a decrease in acetic acid production in cows on a restricted-roughage ration. Hibbs et at. (6), working with calves, found differences in proportions of acids with different grain-to-roughage ratios. Card and Shultz (3) reported significant differences in the percentages of each of the three predominant acids due to general type of ration. Cutting date and methods of curing roughages were also found to have effects; later cutting increased acetic acid and decreased butyric, and silages fed as the sole roughage decreased acetic and increased propionic and butyric acids when compared with hay.

FOOTNOTES

1 Contribution No. 1063 of the University of Massachusetts, College of Agriculture Experiment Station, Amherst, Massachusetts.






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Copyright © 1957 by the American Dairy Science Association ®.