Shell color genetics...

[tjb]

I have pullets from EE rooster/RSL hen {someone told me they were actually production red}
One of my pullets from this pair lays a nice olive green egg, which is what I expected. I have several other pullets close to lay but only one that is 20+ weeks and it is from this cross. The color of the egg I found today is below. Would a blue gene roster produce a pullet that layed this brown?
I have 2 jersey giants — 19wks and a cinnamon queen 18 weeks not layed yet— too nasty weather to check pelvis bones...

 

[keesmom]

EEs aren't pure for blue eggs. They usually have one blue gene and most often brown, or white. The cross you made will result in brown layers and olive eggers.

 

[tjb]

Ok. Thanks good to know. Would you happen to know what gene other than blue would a sapphire super blue rooster carry?

 

[keesmom]

White I believe. So you'll get light brown layers and green/olive layers.

 

[aart]

When you use an EE, it's about a 50% chance a blue egg gene will pass.
There are only blue and white shells,
the brown coatings are other genes and there are a bunch of them.

Try a couple of the threads in the search link below.
There are some folks here who are very knowledgeable about genetics,
I am not one of them.
https://www.backyardchickens.com/search/19094323/?q=blue+egg+genes&t=post&o=date&c[title_only]=1