OHBS/GOV accepts JC-registered mares, but requires inspection of mare and foal. If the mare’s quality is high enough, she will be placed in the MMB, and her foals by approved stallions will be eligible for premium foal awards.
AHS accepts JC-registered mares, but also requires mare inspection. I believe once the mare has been accepted into the AHS mare books, her foals by Hanoverian approved stallions can be registered by mail. It is important to note that AHS is very tough on TB mares, with some being rejected outright.
I am pretty sure ISR/ONA and RPSI also inspect JC-registered mares, and they both require inspection of mare and foal.
The KWPN folks will need to weigh in here, but I believe you can breed a JC-registered mare to a KWPN-approved stallion and get registration papers for the foal without having to get the mare inspected first.
I’m not sure on how BWP or AHHA, etc., view TB mares. Maybe others will chime in with this info.
It’s a little late in the season to be thinking of getting a mare inspected - many registries are winding down their inspection schedules, so you will probably have to wait until next year. Figure out which registries you are interested in - use criteria such as whether they require inspection of mare and/or foal, and if so, whether they typically have an inspection in close proximity to you. Also consider how much value you place on registration papers from that registry (some registries are consider a higher “tier” than others), and which stallions are approved by that registry, etc. Then start making plans to attend an inspection next year for your chosen registry (again, if inspection is required). One plea from this experienced inspection organizer - do not wait until just a few weeks before the inspection to contact the registry and inspection organizer!! Give them - and yourself - plenty of time to get you on the inspection schedule and ensure all your paperwork is in order