Since there was some past discussion here about Welbars, I thought I'd announce that I have them - recreated by faithfully following the "recipe" used by RC Punnett. The first F4 chicks are in the brooder and appear to be completely autosexing.
(female on left, for course)
It is easy to perpetuate Welbars now even if you only have one male. Put him over some pure Welsummer hens and all the F1 pullets are pure Welbar. Bred back to their father, you have a line of true autosexing Welbars. You can't do that with Rhodebars or Legbars, they lose their autosexing traits when bred to the parent breed, but not Welbars.
(female on left, for course)
It is easy to perpetuate Welbars now even if you only have one male. Put him over some pure Welsummer hens and all the F1 pullets are pure Welbar. Bred back to their father, you have a line of true autosexing Welbars. You can't do that with Rhodebars or Legbars, they lose their autosexing traits when bred to the parent breed, but not Welbars.