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Advances in genetic testing over the last several years have benefited horse owners in many ways.

In some breeds where coat color and markings are important for sale value, genetic testing can help a breeder plan matings with greater confidence in the outcome.

Potential breeding stock can also be tested to see if mares and stallions are carriers for certain defects such as hyperkalemic periodic paralysis (HYPP), polysaccharide storage myopathy (PSSM), junctional epidermolysis bullosa, and overo lethal white syndrome. In some cases, mature horses will show no signs of a problem but can produce affected foals in all or some of their offspring if they are mated with another carrier parent.

A genetic testing laboratory may require samples of hair or blood for testing, and the laboratory can provide specific instructions on how to collect, store, and ship the samples. Costs vary for different analyses but are generally not excessive; one laboratory chosen at random from a list of testing facilities shows a rate of $120 to test for six genetic diseases, with a two-day turnaround time.

Owners who want to arrange tests for one of their horses can check with a veterinarian or the equine department of a major university to find a genetic testing laboratory. An internet search will also show contact information for laboratories that can perform this service.

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