Effects of essential oils on ruminal microorganisms and their protein metabolism

F M McIntosh, P Williams, R Losa, R J Wallace, D A Beever, C J Newbold

Research output: Contribution to journalArticlepeer-review

317 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)5011-4
Number of pages4
JournalApplied and Environmental Microbiology
Issue number8
Publication statusPrint publication - Aug 2003
Externally publishedYes


  • Animals
  • Bacteria/drug effects
  • Bacterial Proteins/metabolism
  • Cattle
  • Female
  • Oils, Volatile/pharmacology
  • Rumen/microbiology


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