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it stands for Average Foal Performance Testing, when the foals are tested through the Performance Test, then the PT score of each foal is added together and then that number is divided by the number of foals the mare has and that number is the AFPT score

Stunner--AFPT is an excellent measure of a horse's breeding quality as long as you can compare a group of "like" mares--mares that have been bred to the same stallion(s) and had the same pasture bonus at the time of breeding. Since you can't comparison test mares like you can stallions, many of us use AFPT to weed out our brood mare herds.

While any individual horse's Performance Test score tells you nothing about that horse's breeding ability (only its training potential, which will affect the show level it eventually gets to with consistent training), the average PT of a horse's offspring will be higher for good breeders and lower for worse ones!