Moldy Hay: Bad for Horses, Bad for Humans

Certain strains of fungi found in moldy fodder can cause serious problems in both horses and handlers, scientists found.
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Beware of moldy hay. According to French researchers, it can contain certain strains of mycotoxins that can poison your horse—and yourself.

French researchers have identified, for the first time, specific strains of Stachybotrys fungi in moldy fodder, bringing to light a serious source of toxicity in horses that can cause a variety of symptoms, from mild to fatal.

But that’s not all. That same fungus can also lead to health problems in handlers, said Jean-Denis Bailly, DVM, professor in the National Veterinary School of Toulouse. He presented his group’s work at the 42nd French Equine Research Day, held March 17 in Paris.

Horses are particularly sensitive to Stachybotrys fungi, Bailly said. Clinical signs range from a simple drop in performance levels (lack of willingness to work, refusing jumps, etc.) to sudden death with no warning signs

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Passionate about horses and science from the time she was riding her first Shetland Pony in Texas, Christa Lesté-Lasserre writes about scientific research that contributes to a better understanding of all equids. After undergrad studies in science, journalism, and literature, she received a master’s degree in creative writing. Now based in France, she aims to present the most fascinating aspect of equine science: the story it creates. Follow Lesté-Lasserre on Twitter @christalestelas.

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