Egg Colour Genetics Question

[gojira]

So you can have a brown egg that is not on a white shell?
So there are eggs that are brown inside and out?
I agree eggs start out as white and agree they can code from white to blue. You can quit repeating that part.
I believe the shell is either going to be white or blue. That's the only choice. There is no brown or green shells. There is no brown egg that isn't on a white shell and green is the same brown on a blue shell.
You replies seem to be saying the same thing and at the same time you're saying its not correct.

All shells are white. Both blue and brown are added to white shells. Blue eggs have blue added to white eggshells. Brown eggs have brown added to white egg shells. Green eggs have both blue and brown added to white eggshells. If there are no brown or green shells, then nearly every person on the planet is colorblind. If there are no brown or green shells, there are no blue shells either.

 

[Pyxis]

So you can have a brown egg that is not on a white shell?
So there are eggs that are brown inside and out?
I agree eggs start out as white and agree they can code from white to blue. You can quit repeating that part.
I believe the shell is either going to be white or blue. That's the only choice. There is no brown or green shells. There is no brown egg that isn't on a white shell and green is the same brown on a blue shell.
You replies seem to be saying the same thing and at the same time you're saying its not correct.

This is how I've always understood it too. That there are white egg shells, blue egg shells (which would be white egg shells with blue distributed throughout the whole shell as it is formed, not just painted on the top layer) and that's it. Brown is a pigment layer added over the white shell to make brown eggs, or over the blue shell to make green eggs.

If you get a really fresh brown egg that's still wet from being laid, you can wipe the brown right off; I've accidentally done that before. I've never had that happen with a blue egg.

I do not claim to be a genetics expert so I could be wrong, but what I've read indicated that oocyanin was added throughout the entire eggshell of a blue egg, making the shell itself blue all the way through, while brown was added onto the top, the cuticle, and you can actually wipe or scratch it off, revealing the white shell below it.

 

[junebuggena]

Blue is a dominant modifier of the white shell. It's the dominant allele that pairs with the recessive white, O and o. Blue is not something that is applied after the shell is formed. It affects the fundamental formation of the shell.
Brown genes do not affect or change the shell locus genes. They operate independently of the shell color genes.

 

[ct_chickens]

All eggs start out white. Blue eggs shells have oocyanin added and brown egg shells have protoporphyrin added. The shade of brown depends on the amount of the pigment added to the shell. Green eggs have both, with the oocyanin added first, then the protoporphyrin. They mix together and form green. The shade of green depends on how much protoporphyrin is added. Both are pigments that are added to the shell after it is formed.

 

[gojira]

This is how I've always understood it too. That there are white egg shells, blue egg shells (which would be white egg shells with blue distributed throughout the whole shell, not just painted on the top layer) and that's it. Brown is a pigment layer added over the white shell to make brown eggs, or over the blue shell to make green eggs.

If you get a really fresh brown egg that's still wet from being laid, you can wipe the brown right off; I've accidentally done that before. I've never had that happen with a blue egg.

I do not claim to be a genetics expert so I could be wrong, but what I've read indicated that oocyanin was added throughout the entire eggshell of a blue egg, making the shell itself blue all the way through, while brown was added onto the top, the cuticle, and you can actually wipe or scratch it off, revealing the white shell below it.

There are white eggshells, brown eggshells, blue eggshells, and green eggshells. Brown pigment is added to the shells, not just the cuticle. There is more brown pigment in the shell than in the cuticle. There is an article from 2013 that deals with that. Blue is a pigment layer also, but it penetrates deeper. Think paint versus stain on wood.

 

[Pyxis]

There are white eggshells, brown eggshells, blue eggshells, and green eggshells. Brown pigment is added to the shells, not just the cuticle. There is more brown pigment in the shell than in the cuticle. There is an article from 2013 that deals with that. Blue is a pigment layer also, but it penetrates deeper. Think paint versus stain on wood.

I would love to read that article if you have a link. I am very open to what I have read in the past being incorrect and have no trouble having an open mind to learn more.

 

[gojira]

Blue is a dominant modifier of the white shell. It's the dominant allele that pairs with the recessive white, O and o. Blue is not something that is applied after the shell is formed. It affects the fundamental formation of the shell.
Brown genes do not affect or change the shell locus genes. They operate independently of the shell color genes.

You REALLY need to read accurate information. So you know more than every poultry geneticist in the world? Not likely. White is not recessive to blue. Some feel white is dominant to brown. The O allele is blue or not blue. It is not that difficult.

 

[gojira]

I was told I needed to agree with people more often. I was just agreeing with you. Here is a link: https://academic.oup.com/ps/article/92/10/2783/1551175

 

[The Moonshiner]

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.

 

[gojira]

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.

It is not that easy. One would have to understand how an eggshell is formed to really get it.