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

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248 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)5011-5014
Number of pages4
JournalApplied and Environmental Microbiology
Issue number8
Publication statusPublished - Aug 2003


  • ionophore tetronasin
  • ammonia production
  • rumen bacteria
  • amino-acids
  • monensin
  • sheep
  • peptostreptococcus
  • peptides
  • growth

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