Here there are four registries - Main registry for horses by studs licensed in NL, Bijboek I for horses by studs licensed out of NL, Bijboek II for horses by nonlicensed studs and KFPS-D boek that I'm not really sure what's for but as far as I know it's only a German thing. It's not really rare to find an unregistered friesian because you can register them later in their life, many breeders simply don't want to invest in registering the horse so they leave it to the new owner. As long as you know the parents of the horse (and I think they have to be registered too) you can register anything (providing it's not a cross). Friesian crosses tend to be wonderful horses too, usually much easier to take care of (not that much hair, weight and "clumsiness" - or should I say more athleticism?) and you still get the qualities of the breed, the beautiful personality and looks. There are many friesian crosses out there, I think in US even more than in Europe since here it's not such a pain to buy a purebred one. I'm not a fan of crossbreeding but I know for some people it's the only way to get what they want/need, many successful friesians in dressage are actually friesian/warmblood crosses, riders want friesian high action and looks and a talent and "room" of a warmblood. I never knew what a "friesian sport horse" is, isn't it a cross too? About white markings - Friesians are allowed to have a little star (doesn't matter how many white hairs). My guy has one. That's however the only white allowed on their body - what's strictly not allowed are leg markings and white in their hooves. I wish I could help you more but there are many things that are different in US.
Last edited by mumiinek; 01-26-2011 at 04:51 PM.