The effect of anthelmintic treatment and efficacy on the faecal microbiota of healthy adult horses.

The research article focuses on studying the effects of anthelmintic drugs on the faecal microbiota of adult horses. Particularly, the study investigates the changes induced by drug administration in horses infected with a specific type of parasite, cyathostomin.

Study Design and Participants

• The study involved a sample size of twenty-four adult horses.
• Horses infected with cyathostomin, a common intestinal parasite in horses, were chosen as part of the study, given the known susceptibility and resistance of these parasites to the anthelmintic drugs under investigation, namely oxfendazole and abamectin.
• The horses were then randomly allocated to either the abamectin group, the oxfendazole group, or the control group.

Methodology

• Briefly, faecal samples were collected from all horses before drug administration and on Days 3 and 14 after anthelmintic treatment.
• A minute evaluation of faecal egg counts was done prior to commencement of the study and on Day 14 post treatment, Assisting in the assessment of the effectiveness of the administered anthelmintic drugs in reducing cyathostomin infection.
• DNA was extracted from the collected faecal samples for further PCR amplification and next-generation sequencing analysis using the QIIME2 tool.

Findings

• Results indicated certain notable alterations in the faecal microbiota following administration of anthelmintic drugs.
• In particular, changes in alpha diversity (a measure of the variety of organisms in a given sample) were observed, with levels of evenness and diversity appearing to increase at Day 14, especially within the abamectin group.
• Additionally, differences in the relative abundance of bacteria at various taxonomic levels (phyla, family and genus) were observed after treatment.
• Interestingly, the results suggest that the removal of cyathostomins from the large intestine caused more substantial changes to the microbiota compared to the administration of anthelmintic drugs that were ineffective in reducing the infection.

Conclusion

• The research concluded that the administration of anthelmintic drugs to horses infected with cyathostomins and the subsequent eradication of such parasites influences the faecal microbiota composition.
• This implies that anthelmintic treatment has potential effects beyond just parasite eradication.
• However, the broader implications and possible consequences of these microbiota modifications need to be explored in further research.