Study links oral DHA to airway immune changes in healthy horses
A new American Journal of Veterinary Research study suggests that oral docosahexaenoic acid, or DHA, supplementation can measurably change the lower-airway environment in healthy horses. In a prospective, sequential, placebo-controlled study, North Carolina State University researchers evaluated 10 adult horses, with seven completing the full protocol, after 45 days of placebo and 45 days of an algae-derived DHA supplement with a 14-day washout between phases. The supplement used in the study was Aleira, a commercial product containing 1,500 mg DHA per 30 g daily serving, along with methylsulfonylmethane, mushroom blend, and ascorbic acid. Compared with placebo, DHA supplementation lowered the whole-blood omega-6-to-omega-3 ratio, increased the DHA-to-arachidonic acid ratio, increased alveolar macrophage basal and maximal respiratory capacity, and altered lower-airway protein and lipid profiles, although bronchoalveolar lavage cytology was largely unchanged. (repository.lib.ncsu.edu)
Why it matters: For equine veterinarians, the findings add mechanistic support to the idea that omega-3 supplementation may influence airway inflammation before obvious cytologic changes appear. That’s notable because prior equine work has suggested omega-3 supplementation may improve signs of chronic lower-airway inflammatory disease when paired with low-dust management, and broader equine airway literature points to alveolar macrophages as central players in both triggering and resolving inflammation. This new study was done in healthy horses, not clinical asthma cases, so it doesn’t establish treatment efficacy, but it does strengthen the biologic rationale for DHA as part of a respiratory support strategy. (repository.lib.ncsu.edu)
What to watch: The next step is whether similar metabolic and lipid-profile shifts translate into meaningful clinical benefit in horses with mild/moderate or severe equine asthma under real-world management conditions. (repository.lib.ncsu.edu)