Do your chickens HAVE worms? Have you had a fecal sample tested or seen evidence of worms yourself? I just don't agree with shooting in the dark when it comes to medicating, whether it's myself or my animals. For $20, I take a flock composite (because if one bird's positive, they all are or soon will be) fecal sample to my vet and have them analyze it. Then, I know if they have worms and what kind and can choose the wormer accordingly. Pretty much any vet that runs fecal samples for worms can do this, even if they don't treat chickens. You can always come back to BYC to get information regarding dosing.
