i'm going to go against everyone! Teehee...
I PERSONALLY wouldnt breed to an unregistered stud. But I show in breed shows. I actually have 4 unregistered horses... 2 QH's, 1 pony, and 1 TWH. Registry doesnt matter a lot of times... and there are always state and breed type registries that you can enter horses in and so on and so forth... like one of my unregistered QH's is a registered Virginia Show Horse, whatever that means... which is.. I paid the fee...
OK, never mind... I'm with everyone else.... I'd stick w/ a registered proven horse... is your mare regsitered?
"Be a best friend, tell the truth, and overuse I love you
Go to work, do your best, don't outsmart your common sense
Never let your prayin knees get lazy
And love like crazy"