So if I understand correctly......the best scenario is to breed the ameraucana and marans roo for the olive eggers. That would be the only way to"guarantee" the offspring will lay olive eggs as opposed to breeding the crosses to each other and getting blue or brown egg layers?
Sorry for the confusion...never did well in genetics:)
Yes. A TRUE Ameraucana, not an EasterEgger, would be the best choice - unless you are 100% certain of the EE's bloodline and know that they are homozygous for the blue egg gene. Cross a homozygous bird for blue eggshell with a dark egglayer will give you a 100% chance for olive eggers.
What color is your marans roo? The cuckoos will not give you ver dark olive eggs from the F1 cross. Unless you've got some kind of super-duper cuckoo roo.