The only exception to this was that AQHA continued to let registered Quarter Horses breed with Thoroughbreds and the subsequent offspring could be registered as Appendixed. This was the 5 th organization formed. They calculate percentage of foundation breeding by calculating the percentage of blood of any Thoroughbred influence in a pedigree after the formation of AQHA, i.e., 1940. This is the 6th foundation organization formed. No registered thoroughbred can be any closer than the 4th generation.
Final decisions are by registration committee.
Also, their article specifies that NO Impressive blood may be in the pedigree to be eligible for registration. I have not seen a Rules Book or any Rules and Regulations for this organization and what little information I have is scanty at best and comes from their magazine which is called Foundation Quarter Horse Review. No known email address. No known website address. FQHR calls these the 2 nd and 3 rd generations so it can be confusing.