idk about breed but his legs look really bad...i would treat for leg mites asap. i have read that vasalean helps by suffacating the lice/mites if i remember correctly
I've got no clue on breed but his legs... are awful. Treat it ASAP. I think a lot of people use Vaseline or similar stuff to kill 'em. You'll need to treat the entire coop with sevin dust too.
i smothered my birds legs with vaseline and then repeated after 10 days wait to see if works but if no improvement repeat the previous process untill you can see that the birds are free of leg mite