I\'ve noticed a LF lavender here that is slow feathering, but not half as bad as your bird. This has been a problem that I\'ve seen most often show up in LF silvers. Just don\'t breed from them is my advice.
I talked to a guy, Saturday at the Spring Fowl Fest, that delivers chicks for the biggest commercial hatchery in Michigan. He said all their chicks are feather sexed, so all their breeding flocks have a slow feathering gene.
Be careful of crossing with hatchery stock (aka the chicks at TSC).
Speaking of TSC...I guy stopped in a week ago with 7 Americaunas that came from there back in March. 5 of his pullets are cockerels. So the feather sexing doesn\'t work that well, even on Easter Eggers.