Strong stability and host specific bacterial community in faeces of ponies.
Authors: Blackmore Tina M, Dugdale Alex, Argo Caroline McG, Curtis Gemma, Pinloche Eric, Harris Pat A, Worgan Hilary J, Girdwood Susan E, Dougal Kirsty, Newbold C Jamie, McEwan Neil R
Journal: PloS one
Summary
# Editorial Summary Equine practitioners have long recognised that the hindgut microbiota is critical for efficient fibre digestion and metabolic stability, yet the normal temporal variation in bacterial populations remains poorly characterised. Using 16S rRNA terminal restriction fragment length polymorphism (TRFLP) analysis, researchers examined faecal samples collected at frequent intervals from six ponies over 72-hour periods and again after 11 weeks on an identical high-fibre diet, identifying distinct host-specific bacterial signatures with remarkable short-term stability (P<0.001). Whilst the core bacterial community remained consistent within individual animals over the initial 72 hours, substantial compositional shifts emerged over the 11-week period, accompanied by increases in total short-chain fatty acid production across all ponies—though individual responses in bacterial diversity and specific SCFA profiles varied considerably (P<0.001). These findings provide the first detailed baseline data on microbiotal homeostasis in healthy ponies and establish the degree of individual variation that clinicians should anticipate when interpreting changes in faecal samples or predicting responses to dietary interventions. Understanding this normal stability, alongside host-specific differences, is essential for distinguishing pathological dysbiosis from typical individual variation and for designing evidence-based protocols when managing conditions such as colic or laminitis linked to microbiotal disturbance.
Read the full abstract on PubMed
Practical Takeaways
- •Individual ponies maintain distinct, stable gut bacterial profiles—sudden diet changes risk severe dysbiosis; plan dietary transitions carefully and monitor each animal's response as they vary individually
- •Expect 11+ weeks for full adaptation to new forages or supplements; baseline bacterial populations shift significantly even on the same diet, so allow adequate settling-in time before assessing digestive health
- •Short-chain fatty acid production responds individually to diet—monitor faecal consistency and clinical signs rather than assuming all ponies on the same feeding programme will respond identically
Key Findings
- •Faecal bacterial communities show strong stability within individual ponies over 72-hour periods (P<0.001), with pony-specific profiles
- •Significant shifts in bacterial population composition occur after 11 weeks on the same diet (P<0.001), with increased intra-individual similarity
- •Total short-chain fatty acid (SCFA) concentration increased in all ponies, but individual SCFA changes and bacterial diversity measures varied significantly between animals
- •Host-specific factors create unique, stable microbiota signatures in each pony that are more predictive than diet alone