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Which one is most effective? Egg withdrawal?I would have to agree with @staceyj looks like tapeworm segments from what I can see - a close up photo would be great
See first photo of this post https://www.backyardchickens.com/threads/worms-in-feces-graphic-and-horrible-picture.421028/
You can treat with either Valbazen or Fenbendazole - both are found at feed stores like Tractor Supply. Valbazen dosage is 1/2 ml orally and then repeated in 10 days for each chicken and Fenbendazole (Safeguard, Panacur) dosage is 1/4 ml per pound of weight, dose each chicken separately for 5 days in a row.