01/02/2026
A musty odour, visible white/grey dust, discolouration, or bales that feel damp or unusually warm are common signs of moldy hay⚠️
Moldy hay can irritate the airways and trigger problems ranging from coughing and poor performance to equine asthma/heaves and increased susceptibility to respiratory infections🫁.
It can also expose horses to mycotoxins (toxic compounds produced by some molds), which may contribute to digestive upset, immune suppression, neurological signs, and organ damage, even when hay doesn’t look obviously moldy.
We cover how to spot mold, what symptoms to watch for, and what to do if you suspect exposure in the full article below:
🇨🇦- https://madbarn.ca/dangers-of-moldy-hay-for-horses/
🇺🇸- https://madbarn.com/dangers-of-moldy-hay-for-horses/