That looks like Avispado (and the website that I googled does have Avispado listed. If it is indeed Avispado, he's not champagne at all. Hes homozygous pearl on black. E? aa crcr PRLPRL.
Yeguada isn't the name of the stud farm. Yeguada (as seen in a lot of PRE breeders' names) simply means "broodmare band". Mare in spanish is Yegua or Llegua. So most of the big stud farms are Yeguada-something. :)
Spanish? Pearl is more
Spanish? Pearl is more likely.