Norwegian Jaerhon sex link question

[BroosterSpringsteen]

Can anyone give me more info on the genes that make Jaerhon chicks autosexing? I love this breed, but I can't seem to find much information at all. I adopted some hens (couldn't find a roo), and crossed them with my Black Ameraucana roo, hoping to create some true blue egg laying EEs. The chicks fall into 2 distinct categories. They look very similar to Jaerhon chicks. Some are darker with the white dot on their heads. Could these chicks be sex-linked? I know as a general rule, you can not create sex linked chicks by pairing a sex link breed with a non sex link breed. And I admit I unclear on the difference between auto-sexing and sex link.

 

[donrae]

Here's my understanding---all auto sexing breeds are based on barring. So, the genetics that apply to one autosexing breed apply to them all.

Your hens carry barring, so if crossed to a non barred rooster, they'll throw sex link chicks. White head spots mean male, solid heads mean female. They should all have one copy each of white and blue for eggs, so you should have made sex link blue egg layers.

Since the genetics are the same, you might check out the Cream Legbar, Rhodebar or Biefilder threads. Some educated genetics folks hang out on some of those threads and you can glean some good info.

 

[BroosterSpringsteen]

Thanks! This is what I had suspected has happened. It's kind of cool to have some sex linked blue egg layers. On the other hand, this also means I have a LOT of little roosters in the brooder