I was looking for something else and found this:
http://www.autosexing.co.uk/
Auto-sexing chicks. Make your own!
very interesting! Thanks for the info Catscan.
Wait a minute. Their explanation says these chickens are pure breeds & not hybrids. Then you read about each type & they show crosses. When I went to school, if you cross two different things you had a hybrid.
Our pullets are Gold Star Layer. They also are sexed by color of new hatched babies.
Bernie
I think they are making a distinction between auto-sexing and sex-linked.
With sex-linked you have to repeat the cross to get the same result. Which is why when you see eggs from Black Star or Cinnamon Queens for sale on eBay--you know they won't produce sex-linked chicks, even though the parents were.
With auto-sexed breeds you make the cross once and can then continue breeding from the cross with the same result.
I'm sure they continue the breeding until they come up with a stable breed for all traits...but that breed is then auto-sexing, while the "ancestral" lines weren't.
Okay, I found this, which explains it better:
http://www.autosexing.co.uk/moreinfo.html
Thanks, Catscan, That is a great site!