Evaluation of autologous fecal microbiota transplantation for restoring equine gut microbiota after antibiotic-induced dysbiosis.

Overview

• This study investigated how well different recovery methods restore the gut microbiota in horses after disruption caused by antibiotics.
• It compared natural recovery, autologous fecal microbiota transplantation (FMT), and probiotic administration to evaluate which approach best facilitates restoration of a healthy gut microbial community.

Background and Significance

• Equine gut health depends heavily on a balanced microbial community.
• Antibiotic treatments, while sometimes necessary, disrupt this balance, leading to a condition called dysbiosis.
• Restoring the microbiota after antibiotic use is important to maintain overall health and avoid gastrointestinal issues.
• Current strategies to support recovery include letting microbiota recover naturally, administering probiotics, or performing fecal microbiota transplantation (FMT).
• The effectiveness of these methods in horses, particularly after antibiotic-induced dysbiosis, was not well characterized prior to this study.

Study Design

• The research involved 18 clinically healthy horses.
• Each horse was treated with a combination of two antibiotics: cephalothin and minocycline, for 5 consecutive days, to induce gut microbial dysbiosis.
• Following antibiotic treatment, horses were split into three recovery groups:
• Spontaneous recovery without intervention
• Autologous FMT using the horse’s own pre-antibiotic fecal material
• Probiotic administration
• Gut microbiota changes were tracked over time using microbial amplicon sequencing.
• Bacterial community differences were measured using dissimilarity metrics to quantify how closely the post-treatment microbiota resembled the pre-treatment baseline of each individual horse.

Key Findings

• Antibiotic treatment caused significant dysbiosis in all horses, disrupting their gut microbiota.
• Autologous FMT significantly accelerated the recovery of the gut microbiota compared to spontaneous recovery.
• By day 3 post-treatment, FMT-treated horses showed a microbial community more similar to their original pre-antibiotic state than those recovering naturally (P < 0.05).
• The probiotic group showed benefits only when assessed with cumulative recovery metrics over a longer time period, but not at specific single time points.
• These results suggest that autologous FMT leads to faster and more robust restoration of an individual horse’s native microbial community after antibiotics.

Implications and Conclusions

• Autologous FMT holds promise as an effective clinical intervention to manage antibiotic-induced gut microbiota disturbances in horses.
• Given the faster microbial recovery post-FMT, this method could help reduce complications associated with dysbiosis, such as diarrhea or colic.
• Probiotics alone may provide some benefits but appear less effective or slower compared to FMT in restoring the microbiota to its original state.
• Further research could refine protocols for equine FMT and examine long-term health outcomes following this therapy.
• This study underscores the importance of personalized microbiota restoration strategies tailored to individual horses after antibiotic use.