Ammonia can irritate nose and lung tissue, causing excess mucus production and respiratory issues like heaves. Drs. Jessie Weir-Chouinard, Hong Li, Lori Warren and Erica Macon created a study that fed nine horses forage-based diets with three different levels of protein. The highest-protein diet was 12 percent.

The study horses wore harnesses that collected their urine, which was then combined with wood shavings or straw and tested for ammonia levels. Study results showed that the higher-protein diets led to significant increases in nitrogen levels in urine. Straw bedding had higher levels of ammonia emissions than shavings no matter the diet. Shavings absorbed more of the urine, and ammonia, than the straw did.

The scientists concluded that lowering the protein in a horse's diet can decrease  the amount of ammonia in his stall. This, coupled with cleaning stalls regularly and thoroughly, can combat ammonia and help keep horses airways safe. Proper ventilation is also key.

Read more at EQUUS magazine.

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