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Animal microbiome2020; 2(1); 38; doi: 10.1186/s42523-020-00056-2

Bugs and drugs: a systems biology approach to characterising the effect of moxidectin on the horse’s faecal microbiome.

Abstract: Anthelmintic treatment is a risk factor for intestinal disease in the horse, known as colic. However the mechanisms involved in the onset of disease post anthelmintic treatment are unknown. The interaction between anthelmintic drugs and the gut microbiota may be associated with this observed increase in risk of colic. Little is known about the interaction between gut microbiota and anthelmintics and how treatment may alter microbiome function. The objectives of this study were: To characterise (1) faecal microbiota, (2) feed fermentation kinetics in vitro and (3) metabolic profiles following moxidectin administration to horses with very low (0 epg) adult strongyle burdens. Objective: Moxidectin will not alter (1) faecal microbiota, (2) feed fermentation in vitro, or, (3) host metabolome. Results: Moxidectin increased the relative abundance of Deferribacter spp. and Spirochaetes spp. observed after 160 h in moxidectin treated horses. Reduced in vitro fibre fermentation was observed 16 h following moxidectin administration in vivo (P = 0.001), along with lower pH in the in vitro fermentations from the moxidectin treated group. Metabolic profiles from urine samples did not differ between the treatment groups. However metabolic profiles from in vitro fermentations differed between moxidectin and control groups 16 h after treatment (R = 0.69, QY = 0.48), and within the moxidectin group between 16 h and 160 h post moxidectin treatment (R = 0.79, QY = 0.77). Metabolic profiles from in vitro fermentations and fermentation kinetics both indicated altered carbohydrate metabolism following in vivo treatment with moxidectin. Conclusions: These data suggest that in horses with low parasite burdens moxidectin had a small but measurable effect on both the community structure and the function of the gut microbiome.
Publication Date: 2020-10-14 PubMed ID: 33499996PubMed Central: PMC7807906DOI: 10.1186/s42523-020-00056-2Google Scholar: Lookup
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  • Journal Article

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

This study investigates the impact of a common anthelmintic drug, moxidectin, on the intestinal microbiome of horses. The results indicate that following treatment with moxidectin, there were changes in both the composition and function of the microbiome, particularly in horses with already low levels of parasites.

Research Objective

  • The research aimed to understand the interaction between the anthelmintic drug moxidectin and gut microbiota in horses, particularly in those with low adult strongyle burdens (0 eggs per gram or epg).
  • It aimed to determine if moxidectin altered the faecal microbiota, feed fermentation in vitro (in a laboratory setting), or the host’s metabolic process.

Results of the Study

  • The research showed that moxidectin increased the relative abundance of Deferribacter spp. and Spirochaetes spp. in the horse’s faecal microbiota after 160 hours of treatment.
  • There was a reduction observed in in vitro fibre fermentation about 16 hours after administering moxidectin.
  • The pH from in vitro fermentations was lower in the group that received the moxidectin treatment.
  • Interestingly, metabolic profiles from urine samples did not show significant differences between the treatment and control groups.
  • However, metabolic profiles from in vitro fermentations did vary between the treatment and control groups 16 hours after treatment, and within the treatment group between 16 hours and 160 hours post moxidectin treatment.
  • Both metabolic profiles from in vitro fermentations and fermentation kinetics suggested that carbohydrate metabolism was altered following moxidectin treatment.

Conclusion of the Study

  • The data suggests that moxidectin has a slight but quantifiable effect on the structure and function of the gut microbiome in horses, especially those with low parasite burdens.
  • This suggests that the usage of moxidectin and possibly other anthelmintic drugs can impact the health of horses, potentially increasing the risk of intestinal diseases such as colic.

Cite This Article

APA
Daniels SP, Leng J, Swann JR, Proudman CJ. (2020). Bugs and drugs: a systems biology approach to characterising the effect of moxidectin on the horse’s faecal microbiome. Anim Microbiome, 2(1), 38. https://doi.org/10.1186/s42523-020-00056-2

Publication

ISSN: 2524-4671
NlmUniqueID: 101759457
Country: England
Language: English
Volume: 2
Issue: 1
Pages: 38
PII: 38

Researcher Affiliations

Daniels, S P
  • School of Equine Management and Science, Royal Agricultural University, Cirencester, Gloucestershire, GL9 6JS, UK. simon.daniels@rau.ac.uk.
  • School of Veterinary Medicine, University of Surrey, Guildford, Surrey, GU2 7TE, UK. simon.daniels@rau.ac.uk.
Leng, J
  • School of Veterinary Medicine, University of Surrey, Guildford, Surrey, GU2 7TE, UK.
Swann, J R
  • Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, Imperial College London, London, SW7 2AZ, UK.
Proudman, C J
  • School of Veterinary Medicine, University of Surrey, Guildford, Surrey, GU2 7TE, UK.

Conflict of Interest Statement

None.

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