There may be more to it, it's still not fully understood but in the studies done that I read, the columbian and the slow feathering was segregated out showing it was part of the genetic make up for the Barred Rock which has the finer, more clean looking barring.So let's see if I understand this correctly:
Barred gene= Cuckoo appearance
Barred gene + Slow Feather gene + Colombian= crisp barring
http://www.ultimatefowl.com/viewtopic.php?f=8&t=917
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