Influence of an omega-3 fatty acid-enriched ration on in vivo responses of horses to endotoxin.

This research investigates how a dietary inclusion of linseed oil, which is rich in omega-3 fatty acids, could influence how horses’ bodies respond to endotoxins (toxins present within bacterial cells). The results suggest that horses on a linseed oil-enriched diet showed different responses in terms of blood clotting time and other parameters when exposed to endotoxins, compared to those on a control diet.

Objective and Methodology

• The objective of this research was to understand how altering dietary composition, specifically through adding omega-3 rich linseed oil, could affect horses’ inflammatory responses induced by endotoxins.
• Twelve horses were used in this study. Six of these were given a control diet (pelleted ration with no linseed oil), while the remaining six were given an 8% linseed oil-enriched pelleted ration.
• The two groups were kept on these diets for eight weeks, after which they were exposed to a specific dosage of Escherichia coli 055:B5 endotoxin.

Results and Findings

• After endotoxin infusion, significant changes in several parameters were observed such as rectal temperature, heart rate, plasma concentration of thromboxane B2, 6-keto-prostaglandin F1 alpha, and fibrinogen, and white blood cell count. These parameters are broadly associated with inflammatory responses and were affected across both dietary groups.
• The study found that endotoxin exposure did not manifest any significant changes in a range of other parameters including prothrombin (a protein involved in blood clotting), activated partial thromboplastin (a measure of clotting tendency), thrombin (a clotting factor), whole blood recalcification times, and serum concentration of fibrin degradation products.
• A significant difference in the response between the two diet groups was noticeable in the recalcification time (time for blood to clot in vitro) and activated partial thromboplastin time. Horses given the linseed oil ration displayed longer clotting times compared to those given the control ration, suggesting a potential anti-inflammatory effect of the linseed oil diet.

Implication and Conclusion

• Although more research is needed, the findings suggest a considerable impact of linseed oil (as a source of omega-3 fatty acids) on the inflammatory response and coagulation process in horses during an endotoxic response.
• These data could potentially steer future research into how diet manipulations can influence inflammatory and coagulation responses, not only in horses but potentially in other mammals as well, thus opening up a new field of nutritional science focused on inflammation management.