My foal to be's great great great great grandsire is Poco Bueno, quite far back actually. I contacted my breeder to see if the dam had been tested for HERDA because of her lineage, but she hasn't tested her before. However, she is testing the mare now to see if she is a carrier for the disease. Do I care if my foal might possibly be a carrier for HERDA? Not really, because I most likely will not breed my foal down the road. And if I did, I would most certainly get my horse tested before I did. My breeder is testing her mare, and will let future customers as well as myself if the mare will be a carrier or not. I think it says alot about her, that she's going to test her mare just because I said something. But it definitely will put future customers at ease.