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. 2003 Aug;69(8):5011-4.
doi: 10.1128/AEM.69.8.5011-5014.2003.

Effects of essential oils on ruminal microorganisms and their protein metabolism

F M McIntosh  1 , P Williams, R Losa, R J Wallace, D A Beever, C J Newbold
Affiliations

Effects of essential oils on ruminal microorganisms and their protein metabolism

F M McIntosh et al. Appl Environ Microbiol. 2003 Aug.

Abstract

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.

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Figures

FIG. 1.
FIG. 1.
Effect of EO on the growth of R. amylophilus WP109. Growth was determined with the following additions of EO: 0 ppm (♦), 50 ppm (▪), 100 ppm (▴), 200 ppm (□), 400 ppm (○), 800 ppm (•), and 1,600 ppm (▵). Results are mean values and standard errors of triplicates.
FIG. 2.
FIG. 2.
Effect of EO on the growth of N. frontalis RE1. Growth was measured indirectly by the production of hydrogen in the headspace gas after 10 days of incubation. The results are mean values and standard errors of the means from three cultures.
FIG. 3.
FIG. 3.
Effect of EO on growth of M. smithii. Growth was measured indirectly by the production of methane in the headspace gas after 10 days of incubation. The results are mean values and standard errors of the means from three cultures.
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