There are 178 calves sired by Thunder on the ASA website. All but 2 were bred by Cal-Dak Shorthorns of White River, SD. The -11 MEPD is shown on his certificate, but certainly seems unbelievable. Cal-Dak Shorthorns is still listed as a member if you want to contact them for more information on the bull. I assume the Canadian calves sired by Thunder would not neccessarily be listed on the ASA website. I always thought the sx on a Shorthorn pedigree meant polled sport, too. Guess you learn something every day. My full Irish Leader 18th cow is listed as sx, so I believed she was a polled sport full Irish female for all these years. I was also told many years ago that a true sport would never have a horned calf. As a matter of fact, my 'polled' full Irish cow has only had one polled calf. Live and learn.