The breed business has become a point of discussion at the chicken club here.
After much debate and humour it has been decided that if the egg, or chicken, didn't come from the region the breed comes from it isn't a genuine example.
This decision was entirely based on you can't call whiskey Scotch Whiskey unless it comes from Scotland and you can't call Champagne, Champagne unless it comes from that region and you can't call Cheddar cheese cheddar unless it come from Somerset in the UK among other examples.