I'm not a breeder, but from experience withother kinds of animals, I wouldn't breed siblings. I'm reallynot overly happy with inbreeding of any kind. I've seen theill effects of breeding animals and bringing out recessive traits, itisn't good and REALLY NOT FAIR to the animal. For example: wehave a great dane who has 2 instances of inbreeding in herline. She has all kinds of recessive traits, some no problemlike her coloring, but she also has the bad hips and never formed ACLsin her knees and skin disorders, ear and eye problems....she has seenseveral vet specialists and they all link it back to inbreeding.
All of that said, if there is no other inbreeding in their line, itmight be ok, but as Pam said, I would leave it to the experts.
Jen