Equine asthma — why the stable matters more than any powder

Equine asthma summarises chronic, non-infectious airway diseases that were formerly distinguished as IAD (mild to moderate) and RAO/heaves (severe). The ACVIM consensus statement maps both as a spectrum of one disease — from slight performance loss to visible respiratory distress at rest.

The trigger sits in the air

Driving are inhaled irritants and allergens: dust, mould spores, beta-glucans and endotoxins from hay, straw and bedding. The airways react with inflammation, increased mucus and a narrowing of the bronchi. That explains the leading symptoms — coughing, prolonged exhalation, and in severe form the typical abdominal press.

Why management makes the difference

With hardly any other clinical picture is the lever so clearly on the husbandry side. Steamed hay reduces the dust burden considerably; low-dust bedding such as shavings or cardboard, good stable ventilation and forgoing the hay net in favour of ground feeding noticeably lower the allergen load. Studies show that the willingness of the keepers to implement these environmental measures consistently is the decisive factor for the course.

The forage quality is the root here: hygienically flawless, mould-free hay is a basic prerequisite. Where that is not certain, steaming or alternative forage forms help to lower the spore load. The stable climate — humidity, air exchange, ammonia — co-decides the level of irritation the airways are exposed to daily.

From phytotherapy, plants such as ribwort plantain and thyme are traditionally associated with the airways — ribwort plantain contains soothing mucilage, thyme essential oils. Such building blocks are at most to be classified as supportive; they replace neither the husbandry optimisation nor a veterinarily steered treatment and are no healing promise.