Does a chick hatched from a blue egg= blue egg layer

you really need to know who the dad is

 

sometimes a blue egg layer pullet will mate with say for example a brown egg layer and ofsping will be brown layers

 

 

 

an example is the hybrid white star and amber star

 

the white star is a leghorn male and lihgt sussex female [brown egg layer] but the off spring will have white eggs

 

 

the amber star is a RIR Male and a White Leghorn Female [White egg layer] but the ofspring will have a light brown egg

The blue egg gene is usually dominant so if the one that hatched from the blue egg should prove to be a pullet she is likely to have it as well. Usually. But the father sounds like he is carrying the brown-egg gene so chances are pretty good the two will work together to produce green eggs. Most likely.

But sometimes the genetics don't work the way they usually do and you'll end up with a plain brown egg.

Ditto what A.T. said.  I have gobs of EEs because my egg customers like the blue and green eggs.  I also have some brown and white egg layers, but have EE roos over all of them.  I will say that my hatch rate for chicks that end up laying blue/green eggs is over 75% ( probably closer to 80ish) and I normally will let a hen hatch an equal number of green and brown eggs.

Color genetics of the chicken eggs are superficially straightforward with a dominant/recessive gene, but with possible color inhibiting genes modifying the brown pigment. In your situation, your odds of getting a blue egg layer from a blue-shelled egg are either 50% or 100% depending on your hen's genes.

 

There is a good thread that explains the genetics using Punnett Squares (Punnett was a geneticist that studied genetics by doing crosses back in the 1920's and 30's) Here is a link: http://www.backyardchickens.com/t/25421/blue-egg-genetics/10

 

Here is a link that discusses the color inhibiting genes: http://marans.org/eggreview.pdf

 

In a nutshell, both blue and brown pigments are governed by dominanat genes. If a chicken lacks both of these genes, it will lay a white-shelled egg. A chicken will inherit one copy of each gene from each parent for a total of 2 genes. If the hen lays blue eggs she must have at least one copy of the blue gene and maybe two. If she has one copy, the resulting chick will have a 50% chance of inheriting the blue gene. If she has two copies of the blue gene, it will be 100%.

 

Now for the cross. If the Roo has one blue gene the odds will be 75% and if he has two it will be 100%. Since your roo is a brown egg layer breed, he has no blue genes and his genes don't count towards the blue shell, so it depends on the hen's genes only.  The brown pigment may be influenced by other genes that will ihibit the expression of the brown gene by varying degrees so the color of the brown egg can go from dark to tinted depending on the inhibiting genes. This influences the tint of the green the bluexbrown shell cross from olive to pale.

If both parent are pure for egg color.

 

Blue X Blue = Blue
Blue X White (eg, Leghorn) = Blue to Light Blue
Blue X Brown (eg, RIR) = Green
Blue X Dark Brown (eg, Maran) = Olive Brown

 

 

Chris