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Applied and Environmental Microbiology, August 2003, p. 5011-5014, Vol. 69, No. 8
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.8.5011-5014.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Effects of Essential Oils on Ruminal Microorganisms and Their Protein Metabolism

F. M. McIntosh,1* P. Williams,2 R. Losa,3 R. J. Wallace,1 D. A. Beever,4 and C. J. Newbold1

Rowett Research Institute, Bucksburn, Aberdeen AB21 9SB,1 Akzo Nobel Surface Chemistry Ltd., St. Albans AL1 3AW,2 CEDAR, Department of Agriculture, University of Reading, Reading RG6 6AJ, United Kingdom,4 Crina SA, 1196 Gland, Switzerland3

Received 4 March 2003/ Accepted 2 June 2003

A commercial blend of essential oil (EO) compounds was added to a grass, maize silage, and concentrate diet fed to dairy cattle in order to determine their influence on protein metabolism by ruminal microorganisms. EO inhibited (P < 0.05) the rate of deamination of amino acids. Pure-culture studies indicated that the species most sensitive to EO were ammonia-hyperproducing bacteria and anaerobic fungi.

* Corresponding author. Mailing address: Rowett Research Institute, Greenburn Rd., Bucksburn, Aberdeen AB21 9SB, United Kingdom. Phone: 44 (0) 1224-712751. Fax: 44 (0) 1224-716687. E-mail: FMM{at}ROWETT.AC.UK.

Applied and Environmental Microbiology, August 2003, p. 5011-5014, Vol. 69, No. 8
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.8.5011-5014.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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