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As many Ameraucana breeders have found, it is very difficult to turn off the porphyrin coating once it is turned on. Yes, you can breed an olive egger fairly easily. However, if the zinc white gene is present, the eggs will be tan tinted instead of brown over blue.

Pea comb is one of those genes that can be beneficial in some cases, but in others is undesirable. I wanted rose comb blue egg laying Silver Laced Wyandottes. To get that combination, I had to have the gene for straight comb on chromosome 1. The gene combination of straight comb on chromosome...

To the best of my knowledge, the blue color is the same between the asian and south american variants of oocyanin. It is interesting that larger eggs tend to be slightly lighter blue and smaller eggs are often more intense blue. There is also an effect where pullets just beginning to lay...

The chinese blue oocyanin gene is not just allelic, it is only one step on the chromosome away from the south American version and the best I recall is identical otherwise. In other words, the same virus caused a near identical mutation on two separate occasions. This may sound unusual, but it...

One of those really interesting things to read about is that Punnett - meaning the guy who showed how to use "Punnett" squares - worked with blue egg layers. I had a lot of fun a few years ago reading where he documented that blue egg is a dominant trait and the steps he took to develop true...

Study it carefully. I don't know nearly enough about the genetics yet, but I am learning. The one statement in the above that I am a bit uncertain about is the partridge gene. I know what partridge looks like. What I don't know for sure is whether the gene from Brown Leghorns is actually the...

There is a ton of discussion about egg color genetics on this forum. It is about 80% right, but that leaves a LOT of errors being stated. Here are some points for discussion. All chicken eggs start out as white. This is based on the color of the calcium based eggshell. White egg color is a...