Six intestinal microflora-associated characteristics in sport horses.
Authors: Collinder E, Lindholm A, Midtvedt T, Norin E
Journal: Equine veterinary journal
Summary
# Editorial Summary: Intestinal Microflora-Associated Characteristics in Sport Horses Understanding how the equine intestinal microbiota functions requires examining specific microbial metabolic markers—a research approach well-established in human and other animal studies but less developed in equine medicine. Collinder and colleagues measured six microflora-associated characteristics (MACs) in faecal samples from 19–25 sport horses, assessing microbial degradation of mucin, cholesterol conversion, bilirubin metabolism, trypsin inactivation, amino acid breakdown, and short-chain fatty acid (SCFA) production. Cholesterol-to-coprostanol conversion occurred consistently across all horses regardless of diet, and all animals produced urobilinogen metabolites, though dietary factors influenced excretion levels; notably, equine SCFA levels were considerably lower than documented in humans, rats and pigs, whilst faecal tryptic activity remained minimal. The findings validate the microflora-associated characteristics framework as a practical diagnostic tool for sport horses, potentially enabling practitioners and researchers to evaluate how management, nutrition and clinical interventions influence the intestinal ecosystem—knowledge directly applicable to optimising digestive health and performance in competition animals.
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Practical Takeaways
- •The MAC/GAC concept provides a reliable framework for assessing how diet and management affect equine intestinal microflora function in sport horses
- •Diet significantly influences urobilinogens and likely other microbial metabolic products, suggesting nutritional management is important for optimizing intestinal health
- •Lower short-chain fatty acid levels in horses compared to other species may reflect differences in microbial fermentation patterns and should inform probiotic or prebiotic supplement decisions
Key Findings
- •Cholesterol to coprostanol conversion occurred in 100% of horses regardless of diet
- •All horses excreted urobilinogens with values varying by diet
- •Mucin and beta-aspartylglycine were completely degraded in all horses
- •Short-chain fatty acid excretion in horses was lower than previously reported in humans, rats, and pigs