It remains only for me to point out that most of the big classic long distance races have been won by racing pigeons bred from a first cross, mostly in those cases where an inbred cross has been coupled to a member of another good line-bred, or inbred family. In other words, the first cross champion is usually the product of a coupling between two well-established inbred families, not from an out-crossed specimen mated to another much out-crossed bird.
Taken from The Racing Pigeon & Pigeon Racing For All
by Old Hand