Age and Body Condition Influence the Post-Prandial Interleukin-1β Response to a High-Starch Meal in Horses.
Authors: Suagee-Bedore Jessica, Shost Nichola, Miller Christian, Grado Luis, Bechelli Jeremy
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary Older horses and those carrying excess body condition demonstrate heightened inflammatory responses to high-starch meals compared with younger, leaner individuals, suggesting these populations face distinct metabolic vulnerabilities. Researchers fed horses a high non-structural carbohydrate diet (1.2 g/kg body weight) and measured post-prandial interleukin-1β (IL-1β), a key pro-inflammatory marker, across different age and body condition categories. Notably, younger and lean horses required at least two weeks of daily exposure to this carbohydrate load before demonstrating elevated IL-1β concentrations, whereas older and over-conditioned horses showed significant inflammatory elevation from day one. These findings carry direct implications for feeding management: practitioners working with older or overweight horses should prioritise lower non-structural carbohydrate diets to mitigate chronic inflammatory burden, particularly given the link between IL-1β and conditions such as laminitis and equine metabolic syndrome. Further investigation into the underlying mechanisms driving this age and body condition-dependent inflammatory response would help refine evidence-based nutritional protocols for at-risk populations.
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Practical Takeaways
- •Reduce non-structural carbohydrate intake in older horses and those prone to obesity, as they demonstrate immediate inflammatory responses to high-starch diets whereas younger, leaner horses show delayed responses
- •Monitor feeding management closely for aged and over-conditioned horses, as their inflammatory response to NSC begins on day one rather than requiring weeks of exposure
- •Consider body condition and age when designing dietary protocols for individual horses, particularly those at higher risk for inflammation-related complications such as laminitis
Key Findings
- •Younger, lean horses require at least two weeks of high non-structural carbohydrate (NSC) feeding to elevate post-prandial IL-1β concentrations
- •Older and over-conditioned horses show elevated plasma IL-1β on the first day of high-NSC feeding and thereafter
- •Age and body condition are significant factors influencing inflammatory response to high-starch meals in horses
- •Post-prandial IL-1β elevation represents a pro-inflammatory response that may increase disease risk in susceptible horses