I use Flubendazole, but you can use Safeguard just as well.I dewormed in November or December, and the hen I had necropsied had no signs of parasite issues, so I’d be surprised if that was the issue here. But, I guess it’s worth a try. What would you use? I used safe-guard last time.
How old is this hen? Looks like some kind of production hybrid to me.