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I have a egg color genetics question for all of you about SBs. Do they carry 2 blue egg genes (OO)? I’m trying to figure out if all the F1 chicks from a SB x Marans cross will lay olive or if some will just lay brown. I don’t totally get how the green egg genetics work since it’s so unusual. I have my mind wrapped around blue, brown and white but the pieces aren’t clicking in my brain about how the SBs breed true for green eggs.
It's possible that an SBxBCM cross could lay a brown egg, but I'd expect primarily some shade of olive. The OP, @gapey, wrote this post on her blog that I think may be helpful.
 
They're in! :D

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