Some appendix QHs have a lot of TB blood.
An appendix, as defined by AQHA, is a registered Thoroughbred crossed on a registered American Quarter Horse. The resulting foal is placed in the Appendix registry, and have a different registration number and different color certificate. They are considered a Quarter Horse and are allowed to race and show against QHs. They aren’t allowed to race against Thoroughbreds.
An Appendix horse is considered a QH, but to produce a registered QH foal, it must be bred back to a full QH….UNLESS it proves itself in the QH world by either racing at a certain level or earning a register of merit. If they meet the performance criteria, they can advance to the full registry. Then they could technically be crossed on a Thoroughbred again and thus the higher percentage of TB blood is possible.
Here is some info on the rules: http://americashorsedaily.com/appendix-vs-quarter-horse/#.U3vGjnZCDcs
Obviously they’re breeding a certain type of Thoroughbred. Beduino is a full thoroughbred and was a very influential QH sire, but if you look at a picture of him, he is built for sprinting. http://www.circledhorses.com/beduino_color.jpg
[QUOTE=ravenclaw;7585590]
Didn’t Storm Cat sire some Appendix foals towards the end of his career? Have any of them won any big QH races?[/QUOTE]
He had just one QH foal, named Stray Cat, who won a Grade 3. But Storm Cat has a number of sons who have been sires of QHs. http://www.aqha.com/Racing/News-Articles/Stray-Cat-Wins-Graded-Stakes.aspx