Cross breeding

Hello, I think you made a mistake. You should have kept 1 mixed breed rooster for the next pairing.
F2 mixed rooster paired with parent barred female group = F3a
F2 mixed hen paired with parent barred rooster = F3b

F3a mixed paired to F3b mixed = meat bird hybrid vigor = success or failure.
 
Welcome to BYC

Not sure how the moderators want it handled but I would think posting about the meat crosses would be of great interest and for future ref in the meat birds section.. Maybe link to it from a thread is egg laying.

That was great results off the cross..

Do you plan to try other cross breeding for broilers?

Maybe do another with two other well matched meat breeds.. Then breed the best of that and the ones you kept from the Cornish x Rock cross.
Should make a nice 4 way crosslink resulting rustic broiler.

I have a good idea on a pairing I had planned if you want give it a go.

Since you say the entire set of purebred barred rock you hatched did not lay and none had any internal egg development when butchered; my thought would be a genetic/ developmental issue.. Possibly something how the eggs were handled or something during incubation.. There is research that shows the kinds of defects that can happen to chicks in the embryonic stages if the shell temp vs incubator temp is a bit too high..It was focused on CX broilers. Its what I think happens when some people report a large number of leg and heart issues in a batch of CXs.. Research supports this.. It focused on when eggs are from differing strains or they are of different size to other eggs in the same incubator.. Since you had cross and pures mixed together in the incubator maybe the pures ran a bit hotter or cooler at the shell from differences in metabolize between the hybrids and pure embryos.

Maybe something similar happened but it created true sterility?
 

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