Tying Up In Horses - Recurrent Exertional Rhabdomyolysis (RER)

What is Recurrent Exertional Rhabdomyolysis (RER) in horses?

Tying Up RER in horses is a muscle disease that causes painful muscle contractions. Symptoms include severe muscle pain and distress, apparent colic, excessive sweating, elevated heart and respiration rates, a stiff gait, muscle tremors and a reluctance to move. Milder forms may make the horse simply appear stiff, lazy or slightly lame.

There are various forms of tying up, with the two most common being Recurrent Exertional Rhabdonmyolysis (RER) and Polysaccharide Storage Myopathy (PSSM). The RER form most commonly affects thoroughbreds. Standardbreds can be affected by both forms of tying up.

The form of tying up a horse is affected by determines how it needs to be managed nutritionally.


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