I'd read somewhere something about their feathers getting damaged easily... Mine are fine also.

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I made him. I had 1 Black Mottled Roo over 1 Blue Mottled and 2 Mille Fleur and I got a combination of all and the Blue Mille. The rest of the hatches were tainted by one sneaky young hormones a flying Marans roo. We are now locked down no one in, no one out. Okay so you are saying that I can get Golden Necks???????The problem with blues is that they carry 1 dilute gene, a millie has none, and a gold necked has two. So, by breeding him to a millie, you may get millie or blue. By breeding him to another blue, you may get millie, blue or goldneck. I would pick the best female and go for it! If he's that young, he is going to be spectacular when he's an adult. Great find!
PS- I keep my millies, blue millies and gold necks in the same pen, This way, I'm assured to get all three combinations. I don't have to worry about head points, or other details because they are right on. I only have to worry about spots at this point. Like you, I cull, give my pet quality to local families that just want fancy birds for their kids to play with. I'm about to get some lavenders and they will have to go in a separate pen because of the yellow leakage that could occur from mixing them. I've found lavenders are hard to bring to adulthood. They don't seem as hardy and their feathers are more brittle than most. Still, they are beautiful, albeit difficult to photograph, and deserve a place in anyone's pens!
Okay it is on like donkey kong over here. I will be hatching like crazy and making a little money on unwanted chicks. So if I reverse the order and take a Blue Mottled hen under the Blue Mille Fleur, would I get the same combination? What about a Mille Fleur Roo over a Blue Mottled hen? The wheels are turningI found a great site that breaks down the genetics for Mille fleurs!
http://www.oocities.org/heartland/plains/4175/genes.html
Here's photos of my Self Blue Pullet (looks solid to me)Isn't the lavender/self-blue a solid color? I'm curious about that too, not having one of my own (yet)!