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I would bet, less intense olive eggers as you would introducing more of the white egg shell gene and brown egg shell inhibitors, crossing those F3 with Marans or Welsummers would encrease the dark egg shell trait
if you have pure ameraucanas the ALL of your F1s will have pea combs, if they are just mutts(easter eggers) then you are one of the few breeders that got lucky(about 4%) and got a few recombinants...
it is... but they have overcome that issue. now on legbar the O and the p+ are linked as close as it was O(blue egg gene) to P(pea comb, p+ is single comb)....
you would have to breed about 100 to get 3 or 4 recombinants(O/p+)
so you want a Dark Olive egger that is also sexable at hatch? thats easy.. cuckoo Olive egger.. they are being developed from cuckoo marans... the Barring gene is a sex linked trait.. you can sex barred chicks at hatch