Lipid classes in adipose tissues and liver differ between Shetland ponies and Warmblood horses.
Authors: Adolph Stephanie, Schedlbauer Carola, Blaue Dominique, Schöniger Axel, Gittel Claudia, Brehm Walter, Fuhrmann Herbert, Vervuert Ingrid
Journal: PloS one
Summary
# Editorial Summary: Lipid Composition Differs Markedly Between Horse Types, With Potential Health Implications Metabolic differences between equine species remain poorly understood, yet understanding tissue lipid profiles could illuminate why Shetland ponies and larger horses respond differently to nutritional and inflammatory challenges. Researchers compared six Warmblood horses and six Shetland ponies maintained under identical housing and feeding conditions, using gas chromatography to analyse fatty acid composition across retroperitoneal, mesocolon and subcutaneous adipose tissues, liver, and plasma samples. Horses demonstrated significantly higher n-6 polyunsaturated fatty acid (PUFA) levels across all tissues and plasma compared to ponies, whilst ponies retained higher iso-branched-chain fatty acid (iso-BCFA) concentrations in the liver—a difference particularly pronounced in specific hepatic lipid fractions, where iso-BCFAs were entirely absent in horses but present in ponies. These species-specific lipid profiles suggest fundamentally different regulation of fatty acid metabolism and may help explain divergent inflammatory and metabolic responses between horses and ponies, with implications for tailoring nutritional strategies and understanding disease susceptibility in different equine types. The findings warrant further investigation into whether these intrinsic lipid differences influence proneness to metabolic conditions such as equine metabolic syndrome, laminitis, and inflammatory disorders.
Read the full abstract on PubMed
Practical Takeaways
- •Shetland ponies and Warmblood horses have fundamentally different fatty acid metabolism patterns that may predispose them to different health conditions; metabolic management and dietary strategies should account for these breed-specific differences
- •The higher n-6 PUFA levels in horses may increase inflammatory potential compared to ponies, suggesting breed-specific nutritional approaches to managing inflammation-related conditions
- •These metabolic differences likely explain breed-specific disease susceptibility patterns and support the need for individualized feeding strategies rather than one-size-fits-all protocols
Key Findings
- •Warmblood horses had significantly higher n-6 PUFA levels across all tissues and plasma compared to Shetland ponies
- •Ponies demonstrated higher hepatic iso-branched-chain fatty acids (iso-BCFAs) than horses, with iso-BCFAs absent in several hepatic lipid fractions of horses
- •Adipose tissues in both species were dominated by saturated fatty acids and n-9 monounsaturated fatty acids, while liver and plasma were characterized by n-6 PUFAs
- •Hepatic polar phospholipid fraction showed horses had lower n-9 MUFA and n-3 PUFA but higher n-6 PUFA content than ponies