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Published in Crop Sci 12:277-279 (1972)
© 1972 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Inhibitory Effects of Perloline to Rumen Fermentation in vitro1

L. P. Bush, J. A. Boling, G. Allen and R. C. Buckner2

Inhibition of volatile fatty acid production and cellulose digestion by microorganisms of rumen fluid occurred at concentrations above 9.4 x 10-5 M perloline. Concentrations of 9.4 x 10-5 M perloline and less also inhibited cellulose digestion but stimulated volatile fatty acid production. Growth of two anaerobic cellulolytic bacteria was increased by 10-4 M perloline, whereas growth of all the cellulolytic bacteria was completely inhibited at 10-3 M. At perloline concentrations above 1.13 x 10-3 M rumen protozoa died rapidly, whereas 2.71 x 10-4 M had no noticeable influence on the viability of protozoa.

Key Words: Tall fescue • Alkaloids • Festuca arundinacea

1 Contribution No. 71-03-79 from the Kentucky Agricultural Experiment Station, published with approval of the Director, and from the Plant Science Research Division, ARS, USDA.

2 Associate Professor of Agronomy, Associate Professor of Animal Science, Research Specialist, Department of Veterinary Science, and Research Agronomist, Plant Science Research Division, ARS, USDA, University of Kentucky, Lexington, Ky. 40506.

Received for publication June 16, 1971.




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