If it can be corrected, I may try to get a few Isabellas one of these days. I would love to have the lavender SDWs! I would have to get my hands on some SDW Leghorns and Isabellas first though.Some say it will while others say it won't. I'd heard breeding lavender back to black was how you worked to combat the shredder gene.
When I first got into isabels they were a mess. I got opinions both ways and mostly from experts that hadn't even dealt with it.
I just kind of went it alone. Breeding back to Browns seemed like a plausible idea and at the time a lot of them laid tinted eggs because they were still caring a few Brown egg genes. I figured worse case it would help with that so what the hell.
To me the Wing patch deal was linked to the duckwing pattern because I'd never seen it in other lavender Birds.
I back crossed as much as I could for several Generations. It seemed to work for me. I got rid of the wing patch issues and eventually it seemed like the shredder problems too.
It was said that it was linked closely to the lavender Gene so it followed it around. In my opinion it was linked but it could be separated and that's what seems to happen after I produce so many birds.
I seem to have them completely rid of it for a while but for some reason every now and again it comes back somewhat mostly in the tails. I only have lavender silver duckwing right now so if it ever gets bad again I'll just start over bringing back to Silver duckwing and try to eliminate it completely again.