F10 - F15? no such a thing, But I guess you mean birds that are already past the F1 and more silkie than notI see that this thread has not been commented on in a while, BUT I am VERY interested in working on a Mottled line in my flock. I can start from the very beginning, but id prefer to get some F10-F15 generation birds so I can start working with them heavily in my program, and start exhibiting them in my area, NC. Does anyone have any eggs or birds that they would be willing to part with???