AQHA Board Votes on Key Rule Changes at Convention

The American Quarter Horse Association (AQHA) Board of Directors voted March 9 on the recommendations of the AQHA standing committees as approved in the general membership meeting at the annual convention. The following are the final results of the vote regarding hyperkalemic periodic paralysis (HYPP) and the "white rule."


HYPP is a genetic disease characterized by sporadic episodes of generalized muscle tremors and stiffness accompanied by elevated serum levels of potassium (learn more about HYPP on page 103). The board voted that foals of 2007 and later tracing to the stallion Impressive be required to be parentage verified and tested for HYPP subject to the guidelines in rule 205 (c) (1).

In addition, foals of 2007 and later testing homozygous positive for HYPP (H/H) will not be eligible for registration with AQHA. The board also supported a recommendation made by the AQHA Executive Committee to commence an education and awareness campaign informing the membership of the effects of HYPP.

White Rule

The board voted to delete rule 227 (c) (the white rule) as it applies to the numbered and appendix registries, but to require any horse with white over the current limits to be parentage verified.

The board amended the stud book and registration committee's original recommendation by adding the following wording as rule 205 (d): "Breeders should be aware that the American Quarter Horse, while long recognized, identified, and promoted as a solid-colored horse, can and does occasionally produce offspring with overo paint characteristics. Such markings are uncharacteristic of the breed and are considered to be undesirable traits."

AQHA has been working on computer programming and procedures to implement these changes and was to complete the process by May 1. Members can visit for information concerning horses which might be affected by this rule change.

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