Katie,
Every breeding mare and stallion has to be DNA'ed with AMHA before the foals can be registered. This is to prevent fraud. There have been several cases where farms intentionally lied about who the parents were on foals. There are also cases where farms were so big and had so many horses together they either didn't know who was who, or didn't know which stallion sired which baby. etc. so they just picked the parents for the papers. It is an attempt to keep people honest. The DNA is on file and only checked when needed. There have been instances where a horse was bought at a sale, with the paperwork saying it was sired by a certain stallion, the new owners had it "parent qualified" which means the DNA was tested to match the parents, and come to find out that horse they bought was not related to that stallion at all. There are many circumstances and situations that this happens, its not just with AMHA horses either. There are many breeds the require DNA testing, I am personally in favor of it, it is the associations way of trying to keep accurate records and keep everyone honest. The fee is only $40 or $45 per horse, and that money although you write the check to AMHA, actually goes to the genetics company doing the DNA tests and keeping the records.