I've been using Mollly's herbal wormer. You dose every 3 months or so with it, in between you use a supportive herbal blend weekly. I did the wormer for the second time, and the next day a hen dropped a cecal poop teeming with moving white hairs (worms.).
I did add a few drops of bronners to all the waterers.
worming damange can cause lots of things including gizzard impaction.
the little pullet has been in the kennel all day, still very alert, cheeping, wants out....but hadnt pooped until the third oil dose and crop massage. Then, an explosive poop, right color wrong consistency. Poor baby.
I read somewhere that chickens close their eyes when in pain, and she isnt, but she is making the chick call made when distressed - when can't find the siblings.