There are other breed registries. Let's not leave out the American Quarter Horse. :)
Since the American Quarter Horse formally established itself as a breed, the AQHA stud book has remained open to additional Thoroughbred blood via a performance standard. An "Appendix" American Quarter Horse is a first generation cross between a registered Thoroughbred and an American Quarter Horse or a cross between a "numbered" American Quarter Horse and an "appendix" American Quarter Horse. The resulting offspring is registered in the "appendix" of the American Quarter Horse Association's studbook, hence the nickname. Horses listed in the appendix may be entered in competition, but offspring are not initially eligible for full AQHA registration. If the Appendix horse meets certain conformational criteria and is shown or raced successfully in sanctioned AQHA events, the horse can earn its way from the appendix into the permanent studbook, making its offspring eligible for AQHA registration.
Since Quarter Horse/Thoroughbred crosses continue to enter the official registry of the American Quarter Horse breed, this creates a continual gene flow from the Thoroughbred breed into the American Quarter Horse breed, which has altered many of the characteristics that typified the breed in the early years of its formation. Some breeders, who argue that the continued infusion of Thoroughbred bloodlines is beginning to compromise the integrity of the breed standard, favor the earlier style of horse, have created several separate organizations to promote and register "Foundation" Quarter Horses.[9][10][11]
Open stud books are not uncommon: many Warmblood breeds admit horses of various bloodlines if they meet a conformational or performance standard; the Appaloosa has had an open registry to the Thoroughbred, Arabian and American Quarter Horse; the American Paint Horse has had an open registry to the American Quarter Horse and the Thoroughbred, and the Criollo has had an open registry to the Chilean Horse. A newer breed, the Azteca, is a cross between the American Quarter Horse and Andalusian breeds, and still allows infusions from these sources.
en.wikipedia.org
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