Equine colic: a review of the equine hindgut and colic
Authors: Bland Stephanie D.
Journal: Veterinary Science Development
Summary
Colic remains the leading health threat in horses, yet its prevention and treatment are hampered by incomplete understanding of the hindgut microbiome's role in disease development. Bland's review synthesises current knowledge of how the equine cecum functions as a fermentation chamber and examines how microbial dysbiosis—triggered by dietary insults such as starch overloading, environmental stressors, or immune compromise—permits pathogenic bacteria to proliferate and precipitate colic. The characterisation of cecal microorganisms has historically been constrained by culturing limitations and sampling difficulties; however, next-generation sequencing and metagenomic techniques now enable simultaneous identification of thousands of microbial species, revealing previously invisible microbial populations and their dynamic shifts during colic episodes. These molecular advances offer the tantalising prospect of shifting equine colic diagnosis and treatment from generalised protocols towards targeted, microbiome-informed interventions tailored to specific pathogenic profiles. For farriers, vets, physiotherapists, and nutritionists, this review underscores the critical importance of maintaining hindgut stability through judicious feed management, stress reduction, and prophylactic strategies—interventions that may prove far more cost-effective than managing acute colic once microbial dysbiosis has become established.
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Practical Takeaways
- •Feed management is critical—avoid sudden feed changes and limit concentrate grain to prevent starch overload and cecal dysbiosis
- •Understanding your horse's hindgut microbiome status through modern diagnostic techniques may soon allow targeted treatment protocols rather than empirical therapies
- •Maintain consistent management and monitor for early signs of hindgut dysfunction to prevent progression to clinical colic
Key Findings
- •Colic is the leading health concern and cause of mortality in horses, often linked to disruption of cecal microbiome
- •Starch overloading decreases hindgut pH and alters volatile fatty acid production, triggering pathogenic bacterial proliferation
- •Next-generation sequencing and metagenomic analysis enable identification of thousands of microorganisms simultaneously, revealing previously undetectable microbial populations in the equine GI tract
- •Microbiome-specific diagnosis and targeted treatment could revolutionize colic management and reduce mortality rates