Egg Colour Genetics Question

[ct_chickens]

This is easy folks. Crack any color eggs you have open and look at the inside layer of the shell. Its either blue or white.
Its that simple. You don't need to be an expert or listen to the self proclaimed expert.
Look for yourself. You're not going to see brown on the inside so there is no brown shell just brown on a white or blue shell.

They are all white shells. There are no blue shells. The oocyanin that makes the blue color penetrates further into the shell than the brown pigment. The only shell without pigment is white.

 

[The Moonshiner]

No it is that easy until someone wants to come along and twist it.
Brown eggs are not brown through and though the shell. There for it Isn't a brown shell.
No big deal I get it that you don't usually understand things as well as you think.

 

[ct_chickens]

No it is that easy until someone wants to come along and twist it.
Brown eggs are not brown through and though the shell. There for it Isn't a brown shell.
No big deal I get it that you don't usually understand things as well as you think.

Just because it isn't brown on the inside doesn't mean brown shells don't exist. If you are saying there are only white and blue shells because the blue goes all the way through to the inside, you are wrong. Both the brown and blue are pigments that are added to white shells, therefore it is still a brown egg

 

[The Moonshiner]

I can't agree.
If a shell is white on the inside it Isn't a brown shell. It is a white shell with brown on it.
I agree it is a white egg and brown is added. It is a brown egg but not a brown shell. It doesn't change from a white shell to a brown shell. When bred the white shell goes with the brown coloring.
You can keep crossing back to white shelled layers and breed back to a white egg eventually.
Blue is different. It is either blue or white.
Blue isn't a white egg with blue coloring like brown. You can have a blue egg layer with 2 copies of blue and they produce blue and don't carry the white with them.
You breed a blue to white and you get blue with white. You breed those and you get either the blue or the white gene passed on. Not blue with white like with the brown eggs.
Browns carry white with them. Blues carry blue but not white.
Everyone knows there's a difference with crossing blues and whites then when crossing whites with browns.

 

[ct_chickens]

The blue color is caused by the pigment oocyanin that is added to the shell as it is forming. There are multiple layers to an egg shell, all layers have the blue and/or brown pigment. Oocyanin happens to go through each layer to the other side to make the entire shell blue. Protoporphyrin, the brown pigment, does not have the ability to do that. Just because the shell is white on one side doesn't mean the shell isn't brown. The pigment was still added, therefore the egg has a brown shell.

 

[The Moonshiner]

I just don't agree.
I know how the blue and brown works and I know If you look at a brown egg anyone is going to say that's a brown egg.
This started when someone talked about egg color is determined by three genes blue white and brown.
And that purebreds have either two genes for blue, two genes for white or two genes for brown.
I stated that wasn't quite right.
It was and still is my opinion that it doesn't work that way. There is no simple one gene that causes brown eggs. And that the brown was a different situation then blue or white and that the brown was "painted" on a white egg. Not that there were brown eggs as there were white eggs. I also stated how the same way a white egg was "painted" brown could be done on a blue egg which resulted in green eggs.
Their post made it as if there were blue shells, white shells or brown shells. I was stating that brown shells were white shells underneath.
Half of what you're saying is the same thing. The other half is talking completely outside of what my discuswasn was.
No one is saying look that brown colored egg isn't brown. The point was brown eggs are not an either or with blue and white as that poster thought but that they are brown because of a different situation and it wasnt one gene that determined that but many different genes.
Its not an ABC equals blue white or brown. More of an A or B equals blue or white and then add C to make white into brown or blue into green.

I'll be done with this nonsense now.

 

[gojira]

I just don't agree.
I know how the blue and brown works and I know If you look at a brown egg anyone is going to say that's a brown egg.
This started when someone talked about egg color is determined by three genes blue white and brown.
And that purebreds have either two genes for blue, two genes for white or two genes for brown.
I stated that wasn't quite right.
It was and still is my opinion that it doesn't work that way. There is no simple one gene that causes brown eggs. And that the brown was a different situation then blue or white and that the brown was "painted" on a white egg. Not that there were brown eggs as there were white eggs. I also stated how the same way a white egg was "painted" brown could be done on a blue egg which resulted in green eggs.
Their post made it as if there were blue shells, white shells or brown shells. I was stating that brown shells were white shells underneath.
Half of what you're saying is the same thing. The other half is talking completely outside of what my discuswasn was.
No one is saying look that brown colored egg isn't brown. The point was brown eggs are not an either or with blue and white as that poster thought but that they are brown because of a different situation and it wasnt one gene that determined that but many different genes.
Its not an ABC equals blue white or brown. More of an A or B equals blue or white and then add C to make white into brown or blue into green.

I'll be done with this nonsense now.

You may not agree, but it does not change how things really work. There is one gene that causes brown eggs, and that was shown over 100 years ago. There are other genes that affect the intensity of the brown, and some, or maybe all, will also have an effect if brown is not present. You are correct that the brown pigment does not penetrate all the way through like blue does, but blue is an added pigment also. There is no white shell gene. A gene adds blue or it does not. Another gene seems to inhibit the addition of brown pigment, and other genes control how much brown is added.

 

[The Moonshiner]

Since this thing can go in circles forever with you I'll post my side then let it go.
Every conversation with you is like showing someone a black and white picture and then they want to argue that there is no black or white but just different shades of grey.

The OP is trying to figure egg colors from mixed breed birds that are laying green eggs.
A post stated that there's 3 genes, blue white and brown and that a purebred will have two copies of each.
To some that may sound easy enough. You have A, B or C and you just cross two birds and use a punnett square and fill in the A, B, Cs.
My point is is that it doesn't quite work like that. When it comes to blue eggs and white eggs it is a A or B. Yes you can say there's no white egg gene. White egg is the wild type color or an without any mutations. Blue is a mutation and we've all be schooled on how and why. So yes as far as shell color through and through you only have to choices blue or white. Blue being dominate so 2 genes = blue, 2 white genes or lackit blue = white. One of each = blue but carrying one gene for white or non blue.
That's easy to figure. My point was is that brown eggs are what I said was a different situatione. It isn't like blue and changing the entire color of the shell. The point was it Isn't like blue. It isn't an either or its a different situation so it has to be looked at differently then the blue or white. Brown does not change the entire color of the shell it is merely putting a color on the shell.
When that color is added It looks brown on a white egg and green on a blue egg.
When figuring egg colors or trying to instant what offspring should or may carry or lay you need to look at it separate because it is separate.
You need to look at shell coloring. Is it blue or white or blue carrying white. You can figure what the parents are and figure what the offspring can be.
Then you need to look at brown and remember brown is just getting applied to the outside. If no brown then easy its blue or white.
If brown on white its brown. If brown on blue its green.
If brown on blue carrying white then it green but that offspring could throw genes for blue or white so brown or green.
If someone is not a genetics expert that's the easiest way probably to see how it works.two blue is blue and passes on a blue gene. two whites is white and passes on white. One of each is blue but can pass on either blue or white. Then you figure in the brown. If it has it and it gets added to a white egg you get brown.
Then I also added how brown is different from blue and white and how they get express themselves because it is said that something like 13 genes are involved with brown resulting in different shades.
So the amount of color or those up to 13 genes also have to be considered when figuring egg color.
If you have olive eggs as the OP does or crossing marans or dark brown eggs into the mix you have to start really looking at how the shades of color will come into play.
I was showing how egg color may be easier for some to understand if broke down that way. To show brown was different and had to be look at or thought of differently then blue or white.
Its a shame you had to knit pick and argue instead of seeing what is was trying to do.
Hopefully it helped someone maybe understand a little more then they did.

 

[Trish1974]

I've never had a green egg, only white, blue and brown. What is the color of the shell inside a green or olive egg? Just curious...

 

[The Moonshiner]

I've never had a green egg, only white, blue and brown. What is the color of the shell inside a green or olive egg? Just curious...

Blue.
Same as brown on white except its brown on blue.