Plymouth Rocks that lay blue eggs.

[TheOddOneOut]

My plymouth lays blue eggs .... Who knows if they mated a blue eggs rooster with the mom.

It must be a mutt. Pics of her?

 

[TheFatBlueCat]

They're definitely not supposed to lay blue/green if they are "standard bred". It would be pretty easy to add the blue egg gene to them though as the barring pattern distracts the eye from other features and can easily mislead people. It would also be fairly easy to breed back to having a bird that looks just like a proper barred rock. I'd guess less than 4 generations.
I have a barred rock hybrid project but I would never call my crosses barred rocks.

 

[Og_juice_box_]

It must be a mutt. Pics of her?

Second from left to right..... 3rd pic of her face close up, i got her with the other 2 same hatch ... The naked neck i got her seperate..... But they all lay brown excep this one she lays blue-olive large

 

[TheOddOneOut]

Yeah she’s a mutt. Pea comb gives it away.