They will need trained in the year of birth, young birds bred very late will be on the darkness system because the days will be short. when fanciers breed at Xmas time and put the young on the dark the young birds are about 7 months old going to the first race. Some fanciers are now breeding a late round 7 months before the first old bird race Sep /Oct and the late breds are going to the first old birds race having gone through the body molt but still have full wing. If trained well they are every bit as fast as the old birds. PS stop them after 5 or 6 races.