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The Journal of Equine Veterinary Science recently reported on a study that examined the effects of dietary omega-3 fatty acid supplementation on insulin sensitivity in horses.

In the study, 21 mares were randomly assigned to one of three groups, all of which ate the same diet. Mares in the first group were supplemented with 38 g of omega-3 fatty acids from fish and algae. Mares in the second group were supplemented with 38 g of omega-3 fatty acids from flaxseed meal. Mares in the control group did not receive supplemental fatty acid. Treatments were carried out for 90 days and frequent sampling intravenous glucose tolerance tests were performed on days 0, 30, 60, and 90. Blood samples were analyzed for glucose and insulin.

Results showed that insulin sensitivity increased 39% in all treatment groups. Acute insulin response to glucose decreased 22% between days 30 and 60 and increased again at day 90. Among insulin-resistant mares, those supplemented with omega-3 fatty acid from either source had an increase in insulin sensitivity.

This trial suggests that dietary omega-3 fatty acid supplementation could influence insulin sensitivity for a period of time in some horses. Research conducted at Kentucky Equine Research (KER) showed similar results. Insulin resistance can increase the risk for a number of health problems in horses, and therefore it would be helpful to discover an easy and safe way to increase insulin sensitivity.

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