Egg genetic question.

[pardon_your_honor]

So, I tried to see if anyone else had asked something like and come up empty-handed.

I have a White Leghorn x Ayam Cemani roo (LH mom, AC dad), that I was planning on pairing him with my Dekalb White girls. I'm trying to get an idea of egg colors in offspring. I seem to remember reading somewhere that white egg genes have to have two parents. Dekalb lay white, same as White Leghorn. But Ayam Cemani lay cream/off-white.

So, I guess my question is would I be looking at 75% cream to 25% white in the offspring?

 

[The Moonshiner]

There's only two choices in actual egg shell color. White or blue. Blue is dominate over white so if a bird has a parent that passes a blue shell gene to the offspring then it will show. That's probably where you got the idea it needs both parents to have white egg genes.
Off white, cream, brown etc is a whole different set of genes. Those are caused by a pigment applied to the egg. Brown tones are one white shells. Green tones are the same genes on blue shells.
Brown tones are more complicated because there's up to 8 or more genes that could be in play. That's why there's so many different shades of brown eggs.
You white egg layers won't contribute any of those genes but your AC will. It's a gamble as to what a pairing like that will produce. Kind of standard that the shade of brown will be inbetween somewhere but could be a lot lighter or darker then the average between the two.
Since the hens don't have any of the brown genes and the ACs lay very light eggs I'd expect most to be close to AC color or a bit lighter but not bright clean white as the hens lay.

 

[pardon_your_honor]

There's only two choices in actual egg shell color. White or blue. Blue is dominate over white so if a bird has a parent that passes a blue shell gene to the offspring then it will show. That's probably where you got the idea it needs both parents to have white egg genes.
Off white, cream, brown etc is a whole different set of genes. Those are caused by a pigment applied to the egg. Brown tones are one white shells. Green tones are the same genes on blue shells.
Brown tones are more complicated because there's up to 8 or more genes that could be in play. That's why there's so many different shades of brown eggs.
You white egg layers won't contribute any of those genes but your AC will. It's a gamble as to what a pairing like that will produce. Kind of standard that the shade of brown will be inbetween somewhere but could be a lot lighter or darker then the average between the two.
Since the hens don't have any of the brown genes and the ACs lay very light eggs I'd expect most to be close to AC color or a bit lighter but not bright clean white as the hens lay.

Thank you!