Is this what is used to worm chickens? Is there a chicken ivermetrin? I've heard of it for horses but on the package it says not intended for animals that will be used for food. Am I remebering correctly? What about DE? I know get the food kind, is it good for all worms? What kinds of worms do chickens get? Never worried about them getting worms before I started reading this forum. What are the signs? Learning lots here!