Wow, that roo is wild looking. There was a discussion here not that long ago if a chicken could have more than one father the answer was yes. I think that is the case with mosaics. Sexual chimeras can be half and half too . The chicken will look like a cock on one side and a hen on the other. I am not sure how to tell one from the other without genetic testing except to wait and see.
If you don't mind spending money, you may want to contact UC Davis about genetic testing. When I realized my mare was brindle I sent a tube of blood in and tail hairs. Cost $100. I wonder if you could pluck feathers from both sides and see if they came back with different dna.
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Hennypen, I would really like to see a photo of your mare. They are so rare that I have already seen every photo that is online of a brindle horse. I will find out in a few weeks whether this bird is chimera or mosaic. On a chimera, one side will start developing like a rooster and the other like a hen. Way too soon for that although one side already appears to have the coloring of a cockerel and the other side of a pullet. I think it takes a few weeks to get the results back from genetic testing, anyway, so I will wait and see. I think even mosaics are pretty rare, especially ones like this one that are called "double siders".
Honestly the more I look at this chicken it looks just like a chicken. I see no quail attributes to it at all. Are you sure the hen wasn't around any other male poultry/fowl for the 3 weeks BEFORE she laid this egg? a hen can lay eggs still fertile for 2-3 weeks after being seperated from a roo so are you absoposilutely sure that the hen was fertilized by a quail? Cause I just don't see it. The chicky in question looks like a partridgey colored feather leg bantam.
don't worry I'm a believer, I once posted up my Chinese pheaseant x naked neck cross & lots of people on here were saying it was some other type of breed. But how would they know if I bred them myself.
I am not too worried. It has been indeed been verified by biologists at a major university. While I have learned more about chickens on this forum in the past few years than I have learned in a lifetime, it is not always the final authority.