The First Horse Gut Microbiome Gene Catalog Reveals That Rare Microbiome Ensures Better Cardiovascular Fitness During Endurance Racing
Authors: Mach Núria, Midoux Cédric, Leclercq Sébastien, Pennarun Samuel, Moyec Laurence Le, Rué Olivier, Robert Céline, Sallé Guillaume, Barrey Eric
Summary
# Editorial Summary A comprehensive cataloguing of equine faecal microbiota—comprising over 25 million genes across 4,696 bacterial genera—has revealed that endurance horses with greater microbial diversity exhibit superior cardiovascular fitness compared to those with microbiomes dominated by Lachnospiraceae. Researchers analysed faecal samples from elite endurance competitors and integrated these genomic findings with host physiological data to identify functional metabolic pathways, uncovering 369 previously undescribed bacterial genomes in the process. Horses harbouring rare microbial species demonstrated expanded metabolic capacity to modulate cardiovascular function through mitochondrial mechanisms, suggesting a direct mechanistic link between microbial composition and exercise performance. For equine practitioners, these findings suggest that targeted nutritional strategies promoting microbial diversity—rather than selection for specific dominant taxa—may offer a practical lever to enhance endurance capacity and athletic resilience in performance horses. This work establishes the foundational microbial reference catalogue necessary for developing evidence-based prebiotic or probiotic interventions tailored to optimising metabolic and cardiovascular function in equine athletes.
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Practical Takeaways
- •Microbiome diversity—particularly rare bacterial species—may be a key factor in endurance horse performance; consider this when managing nutrition and training
- •Horses with more diverse, species-rich microbiomes show better cardiovascular fitness during endurance work, suggesting microbial diversity should be a management goal
- •Future nutritional strategies targeting microbiome composition (favoring rare species over dominant Lachnospiraceae) could enhance endurance athletic performance
Key Findings
- •First equine gut microbiome gene catalog created with 25 million non-redundant genes representing 4,696 genera across 95 phyla
- •Microbiomes with rare species showed superior cardiovascular capacity compared to those enriched in Lachnospiraceae taxa
- •Rare microbiome species provide expanded metabolic pathways that fine-tune cardiovascular capacity through mitochondria-mediated mechanisms
- •Associative link identified between endurance capability and microbiome gene function