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Applied and Environmental Microbiology, March 2001, p. 1366-1370, Vol. 67, No. 3
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.3.1366-1370.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Plant-Derived Oils Reduce Pathogens and Gaseous Emissions from Stored Cattle Waste

Vincent H. Varel* and Daniel N. Miller

Roman L. Hruska U.S. Meat Animal Research Center, Agricultural Research Service, USDA, Clay Center, Nebraska 68933

Received 2 October 2000/Accepted 8 December 2000

Carvacrol and thymol in combination at 6.7 mM each completely inhibited the production of short-chain volatile fatty acids and lactate from cattle waste in anoxic flasks over 23 days. Fecal coliforms were reduced from 4.6 × 106 to 2.0 × 103 cells per ml 2 days after treatment and were nondetectable within 4 days. Total anaerobic bacteria were reduced from 8.4 × 1010 to 1.5 × 107 cells per ml after 2 days and continued to be suppressed to that level after 14 days. If the concentration of carvacrol or thymol were doubled (13.3 mM), either could be used to obtain the same inhibitory fermentation effect. We conclude that carvacrol or thymol may be useful as an antimicrobial chemical to control pathogens and odor in stored livestock waste.

* Corresponding author. Mailing address: Roman L. Hruska U.S. Meat Animal Research Center, USDA Agricultural Research Service, P.O. Box 166, Clay Center, NE 68933. Phone: 402-762-4207. Fax: 402-762-4209. E-mail: varel{at}emailmarc.usda.gov.

Applied and Environmental Microbiology, March 2001, p. 1366-1370, Vol. 67, No. 3
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.3.1366-1370.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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Copyright © 2001 by the American Society for Microbiology. All rights reserved.