Kindof a tangent, but I had muscovy ducks and a turkey that would seem to be almost constantly broody. They would pull
chicken and other ducks’ eggs, and at times hens or other ducks under their wing. After a particularly cold night, I went out to see Laverne the spanish cross turkey with a young muscovy hen that she’d helped protect its entire life under her wing, and a sweet blonde orpington under the muscovy’s wing. Muscovies are excellent mothers, and seemed to have very high survival rates until they overpopulated their space. I would bet less inbred chickens would be better mothers than true breeds, which may have had artificial incubators for generations. Americanas have been good hardy free range birds for me, but I have not kept an Americana rooster so don't know about their breeding. I agree with the post above about providing a sweet living situation for them, and babies follow.