For horses, dust isn't a nuisance. It's a chronic disease.

The horse hay problem

Horses are obligate nasal breathers, and they spend hours each day with their muzzles in hay. Mould spores, dust particles, and bacterial contamination in stored hay aren't background concerns for horses — they're the inhaled environment. The veterinary literature on equine respiratory disease points consistently in one direction: dust and mould exposure are the dominant drivers.

✓ Confirmed RAO (Recurrent Airway Obstruction, also called heaves) and IAD (Inflammatory Airway Disease) are strongly associated with dusty, moldy hay. Veterinary consensus across decades of research points to hay quality as the primary controllable factor.

⊙ Field Knowledge Horse hay buyers are the most quality-sensitive segment of the entire forage market — they pay premium prices, reject heavily, and ask hard questions. A hay-buying decision in this market involves smell tests, visual inspection, and often lab analysis.

What HayRite does for horses

1. Dramatically less mould

◐ Trial Data 2023 trial results: stem mould 33% → 0%, leaf mould 70% → 2%. For horse buyers and barn managers, this is the most important number on this site.

2. Less dust

⊙ Field Knowledge Hay dust correlates strongly with mould development during storage — mould fragments, broken-down leaf material, and microbial debris all add to the dust load. Less mould generally means less dust, though the exact relationship depends on baling moisture and storage conditions.

3. Better-smelling, more palatable hay

⊙ Field Knowledge Off-smelling hay is the most common reason horses refuse a load. Treated hay that's stayed cool and mould-free during storage retains the green, sweet, slightly herbal smell that horse owners and horses both prefer.

Practical advice for horse hay buyers

If you're a barn manager or boarding facility evaluating HayRite-treated hay from a supplier:

• Open a bale and inspect the core. Treated hay should be cool, green-toned, and mostly free of visible mould. Some surface dust is normal; pervasive white or grey mould is not.
• Smell it. Treated hay should smell mildly herbal and slightly sweet. A strong barnyard or musty smell indicates the treatment didn't work or the hay was baled too wet for the rate.
• Ask your supplier about application protocol. 100 mL/tonne, baler-mounted sprayer, applied at baling. If the supplier can't tell you those details, the treatment may not have been done correctly.

If you grow your own hay

Many horse facilities and small-acreage owners grow some or all of their own hay. HayRite application is a baler-side equipment investment — typically a small electric or PTO-driven sprayer mounted on the baler.

✓ Confirmed No withholding period — hay can be fed immediately after baling.