This will help fill in the gap. I will also say registering a foal with RPSI, AWS or AWR is not even close to the 1000s.
Below is the start of the AES (Anglo-European Studbook NA) and Summer Stoffel is in the process of getting it organized (below was quoted from a post of hers)
AES(NA) passports are directly issued from AES. So they are reciprocal. They are one and the same. There had to be an AESNA site because the registration options had to be altered on the form to make sense to NA breeders. But the passports are the same.
Many of the major registries offer “Horse Identification” passports. They do this in the EU because it is a requirement by EU law that every horse have a microchip and a passport with a 15-digit UELN number. On the AES site there is the option of “neither parent AES registered” for the following reasons:
1.) If the parents are registered with the AES, it will auto-fill the parents information if it is already in their database, so if they are not, then it will ask you to fill in the parent information if it is available
2.) If the parent is already approved by the AES or a recognized WBFSH registry that is approved with the AES it will make the foal/horse eligible for a certain color/level of passport.
3.) It provides an option for US horses who have never been registered with a breed registry but cannot prove pedigree to obtain a “HORSE IDENTIFICATION” passport that links a 15 digit UELN number with a microchip number.
The third option was crucial to the success of the microchip rule being passed at USHJA and USEF and was primarily directed at American breeders/owners who have been producing horses without registration. We also now have the USEF/USHJA rule that requires horses’ CP or breed papers/passport in order to compete in USHJA age restricted classes beginning Dec. 1, 2017. It is about changing the mindset of our culture. It has to start somewhere. When deciphering whether a breed registry is one of “those” registries it is important to look at whether the registry is issuing “full” papers, a “CP”, or “Horse ID” paper or passport. The word “registered” has been used as an all encompassing word, but sometimes there are many levels. Horses registered through the AES site in the US that do not have proof of pedigree or from unapproved parents will get a Horse Identification Passport. Nothing more.
This subject of horse identification and registration has been discussed in length with all the breed registries in joint meetings and they are willing to help and contribute. There are already other breed registries in the US issuing these “Horse ID” papers/passports. This permanent attachment of a horse ID and microchip number to the horse in conjunction with the new horse ID/microchipping rules is designed to lead into a system that minimizes fraud and create an infrastructure that supports American breeders, such as ones on this forum, to be able to track their horses throughout their entire life in sport and in breeding. Time to start connecting the dots.