I don't know if it would work on chickens (don't really know why not) but black walnut hulls , the type you buy in the gelatin capsules in the health food section of the store worked to de-worm our dogs. Worked really well as a physical agent, not a chemical one. I just open the capsules (2-3 for a dog, probably need more for chicken feed, depending on how many you have) and dump it in their wet food and mixed it in once a day for a week or two, until I didn't see any evidence of worms in their stools anymore. Maybe do a mash of yogurt, crumbles and black walnut hulls to deworm a small number of birds. It's totally harmless, too.
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