Drs. Mary Walsh, Courtney Meason-Smith, Carolyn Arnold, Jan Suchodolski and Erin Scott used molecular-based DNA testing to identify what type of fungi were present in the eyes of 12 horses: five mares that lived outside and seven stallions that lived in stalls.

The scientists took eye swabs from each eye of the 12 horses, then extracted and sequenced the genomic DNA from the swab.

The scientists found that the equine eye is host to many fungal, bacterial and viral organisms, and that the composition and structure of fungi varied significantly between pastured and stabled horses.  Though many horse owners associate these organisms with eye issues, previous studies have shown that fungi may occur naturally on the eye: between 13 and 95 percent of eye swabs performed on healthy horses were positive for fungal growth. 

The team determined that horses that were exposed to a variety of plant matter, like grasses, as well as to fluctuations in temperature and humidity, are more likely to have a wider range of fungal organisms in their eyes than horses that live in stalls, where the environment is more controlled. The differences in composition, structure, and richness of fungi inhabiting the equine ocular surface is most likely affected by the housing environment in which a horse lives, they concluded.

They also noted that horses that live on pasture may be more at risk of fungal infections if their eye is injured.

Read the full study here. 

Read more at HorseTalk.

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