Changes in metabolic and physiological biomarkers in Mangalarga Marchador horses with induced obesity.
Authors: Ribeiro Rodrigo M, Ribeiro Debora S, Cota Leticia O, Leme Fabiola O, M Carvalho Armando, Faleiros Rafael R
Journal: Veterinary journal (London, England : 1997)
Summary
# Editorial Summary: Metabolic Changes in Obese Horses Nine Mangalarga Marchador horses were deliberately overfed for five months to investigate how excess energy intake affects metabolic and cardiovascular function, with researchers measuring lipid profiles, glucose tolerance, arterial blood pressure and fructosamine (a marker of medium-term glycaemic control) at regular intervals. The high-calorie diet triggered significant increases in total cholesterol, LDL cholesterol, HDL cholesterol and fructosamine concentrations, with all four parameters showing strong positive correlations to insulin response during oral glucose tolerance testing. Notably, these findings demonstrate that hypercholesterolaemia develops in tandem with insulin dysregulation—rather than as separate conditions—suggesting a mechanistic link between lipid metabolism and glucose handling in obese horses. For practitioners managing equine weight loss or metabolic disease, these results support the case for monitoring both lipid and glucose markers concurrently rather than focusing solely on insulin or triglycerides, and underscore the importance of preventing obesity progression, since even modest dietary overfeeding appears to trigger measurable systemic changes within weeks. The correlation between fructosamine elevation and insulin dysfunction is particularly relevant for early detection of metabolic disease before overt laminitis develops.
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Practical Takeaways
- •Overfeeding horses rapidly induces metabolic dysfunction including elevated cholesterol and insulin dysregulation within 5 months, indicating feed management is critical for metabolic health
- •Monitor blood biomarkers (cholesterol, lipoproteins, fructosamine) and glucose tolerance testing in horses receiving high-calorie diets to detect early metabolic changes before clinical disease develops
- •Restrict caloric intake in horses to prevent obesity-related metabolic complications; even moderately overweight horses (BCS 2.9) can develop significant lipid and insulin abnormalities
Key Findings
- •9 horses fed a hypercaloric diet for 5 months showed significant increases in cholesterol, LDL, HDL, and fructosamine concentrations (P < 0.001)
- •Cholesterol, LDL, HDL, and fructosamine were positively and significantly correlated with insulin response during low-dose glucose tolerance testing
- •Hypercholesterolemia developed concomitantly with insulin dysregulation in horses exposed to high-calorie feeding
- •Body condition score increased from baseline mean of 2.9 ± 1 following 5 months of hypercaloric diet introduction