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There isn't a single answer to this. Some do, some don't. Some use only things like cayenne. I have been worming with Valbaen or Eprinex annually, but perhaps should be doing it twice a year. Dawg53 I think worms 4 times a year, Pine Grove worms at least 6 times a year, and both...
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If they free range in a variety of forages, they may be finding enough out there to keep their load down. You could get a fecal done. See if your vet will do one on a poop sample you bring him; many will, for $10 or $20. Or you could just worm them and see if your feed consumption...
On Wazine not being recommended for laying hens, remember that these are recommendations for commercial operations, and sometimes have more to do with govt. regulations than chicken health. People give Wazine then eat the eggs all the time (I don't know the withdrawal for Wazine.)
On worming...