Effects of Thymol on Ruminal Microorganisms

@article{Evans2000EffectsOT,
  title={Effects of Thymol on Ruminal Microorganisms},
  author={Jeff D. Evans and Scott A Martin},
  journal={Current Microbiology},
  year={2000},
  volume={41},
  pages={336-340}
}
Thymol (5-methyl-2-isopropylphenol) is a phenolic compound that is used to inhibit oral bacteria. Because little is known regarding the effects of this compound on ruminal microorganisms, the objective of this study was to determine the effects of thymol on growth and lactate production by the ruminal bacteria Streptococcus bovis JB1 and Selenomonas ruminantium HD4. In addition, the effect of thymol on the in vitro fermentation of glucose by mixed ruminal microorganisms was investigated… 
Effects of Thymol Supplementation on Goat Rumen Fermentation and Rumen Microbiota In Vitro
TLDR
Network analysis showed that bacteria, archaea, and protozoa significantly correlated with methane production and VFA production, and an optimal dose of thymol at 200 mg/L is indicated to facilitate rumen fermentation, the critical roles of bacteria in rumen fermentations, and their interactions with the archaea and protzoa.
Effects of thymol, eugenol and malate on in vitro rumen microbial fermentation.
TLDR
At the low ruminal pH expected in high-concentrate diets, thymol, eugenol, and malate are potentially useful in Hanwoo finishing diets and further studies are necessary for determining the effectiveness of these additives on in vivo rumen fermentation and animal performance in HanWoo finishing steers.
Preliminary in vitro study on the effect of xanthohumol on rumen methanogenesis
TLDR
For the first time, the results of this in vitro study have demonstrated that xanthohumol is capable to reduce the methane production, even at the lowest dose applied (0.1 mg/400 mg).
Effects of thymol and carvacrol, alone or in combination, on fermentation and microbial diversity during in vitro culture of bovine rumen microbes
TLDR
Methane production by the microbial populations appeared to be higher with treatments containing the highest concentration of thymol than with treatment containing more carvacrol resulting in a tendency for greater methane-inhibiting activity achieved as the thyml concentration in the thysanol:carvacols mixtures decreased linearly.
Assessment of Rumen Microbial Adaptation to Garlic Oil, Carvacrol and Thymol Using the Consecutive Batch Culture System
Introduction Abstract Although plant derivatives have shown promise in reducing enteric methane (CH4) emissions from ruminants in short-term studies, investigation on possible rumen microbial
Effects of the Thyme Extract on the Ruminal Methane Production
2 Abstract: An experiment was conducted to study the effects of Thyme Methanol Extract (TME), on rumen methanogenesis in vitro. Different levels (0, 0.25 and 0.5 mL) of TME were incubated for 2, 4,
Effects of a selection of additives on in vitro ruminal methanogenesis and in situ and in vivo NDF digestibility.
TLDR
A careful selection of additives may allow for the manipulation of ruminal fermentation in cows to determine in situ neutral detergent fiber digestibility of six forages and in vivo dietary NDFD.
In vitro screening of the potential of numerous plant species as antimethanogenic feed additives for ruminants
TLDR
Some candidates, in particular Rheum nobile and Carduus pycnocephalus , consistently decreased methane production without adversely affecting other parameters of the rumen fermentation.
The effect of essential oils of Zataria multiflora and Mentha spicata on the in vitro rumen fermentation, and growth and deaminative activity of amino acid-fermenting bacteria isolated from Mehraban sheep
TLDR
Results indicated that both essential oils could potentially be used to modulate rumen fermentation and the detrimental effects on fibre digestion could be problematic in high-forage diets, and this requires further investigation.
Screening the activity of plants and spices for decreasing ruminal methane production in vitro
Abstract Different plants, herbs and spices (158 samples) were tested in a screening trial to assess their potential to modify ruminal fermentation in vitro , in particular their effectiveness for
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 22 REFERENCES
Effect of Extracellular Hydrogen on Organic Acid Utilization by the Ruminal Bacterium Selenomonas ruminantium
TLDR
The results suggest that electron transport plays a role in organic acid utilization by S. ruminantium and that cellular carbohydrate levels were lower for both strains in cells grown on either organic acid plus H2.
The action of thymol on oral bacteria.
TLDR
Correlations between leakage-inducing concentrations of thymol and minimal inhibitory concentrations and minimal bactericidal concentrations suggest that membrane perforation is a principal mode of action of this substance.
Factors that interact with the antibacterial action of thyme essential oil and its active constituents.
TLDR
It is suggested that the effects of BSA or Desferal are due to their ability to bind phenolic compounds through their amino and hydroxylamine groups, respectively, thus preventing complexation reactions between the oil phenolic constituents and bacterial membrane proteins.
A proposed mechanism of monensin action in inhibiting ruminal bacterial growth: effects on ion flux and protonmotive force.
  • J. Russell
  • Chemistry, Medicine
    Journal of animal science
  • 1987
TLDR
Streptococcus bovis, a Gram-positive ruminal bacterium, was unable to grow in the presence of monensin, and previous models were not supported by experimental measurements of intracellular Na+ and K+.
Inhibitory effect of oregano and thyme essential oils on moulds and foodborne bacteria
TLDR
The essential oil of oregano (‘origanum oil’; thymol type oil from Origanum vulgare) inhibited completely the mycelial growth of Aspergillus niger and A. ochraceus and the antagonistic effect of the two oils on Staph.
Regulation of lactate production in Streptococcus bovis: A spiraling effect that contributes to rumen acidosis.
TLDR
The small increase in fructose-l, 6-diphosphate and decreased requirement of lactate dehydrogenase for fructose- l,6-dphosphate under acidic assay conditions, accounted for increased lactate production during low pH (4.7) continuous culture and explains why rumen acidosis is difficult to reverse.
ANTIMICROBIAL EFFECTS OF SPICES
There is a renewed interest in the antimicrobial properties of spices. In vitro activities of several ground spices, their water and alcohol extracts, and their essential oils have been demonstrated
Antimicrobial Activity of Some Egyptian Spice Essential Oils.
TLDR
The data show that Gram-positive bacteria were more sensitive to the antimicrobial compounds in spices than Gram-negative bacteria, and Thyme and cumin oils possessed very strong antimicrobial activity compared with the other essential oils.
Antifungal action and antiaflatoxigenic properties of some essential oil constituents
  • A. Mahmoud
  • Biology, Medicine
    Letters in applied microbiology
  • 1994
TLDR
Five oils, namely geraniol, nerol and citronellol (aliphatic oils), cinnamaldehyde (aromatic aldehyde) and thymol (phenolic ketone), completely suppressed growth and aflatoxin synthesis.
Antimicrobial and Cytotoxic Activities of Origanum Essential Oils
Three Origanum essential oils, Origanum vulgare ssp. hirtum, Origanum dictamnus, and a commercially available Origanum oil, were analyzed by gas chromatography−mass spectrometry (GC−MS) and showed a
...
1
2
3
...