Ok so I suspect my chickens have a parasite.... A few look as if they've lost weight. I need to get a scale.. .. I wormed with safeguard one time and then again 10 days later.....did I do it correctly? Or am I suppose to do 3 days then 10 days?
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For most worms or routine worming, SafeGuard (fenbendazole) or Panacur should be given 1/2 ml by mouth once and repeated in 10 days. For other bad worms such as gapeworm which is rare and resembles a respiratory infection, the fenbendazole should be given at a larger dose--1/4 ml per pound of weight (example 5 lb chicken gets 1.25 ml) for 3 to 4 straight days. Ideally, a vet could run a test for worms on a collective stool sample.
With gapeworm, there is an emergency. Chickens will be in great respiratory distress, gasping with every breath, and the others may have it. There are some old posts that say you can swab the throat and if you see red worms, that is gapeworm, but I believe that is false information. I believe the only way you can prove it, is to confirm with a stool sample at the vet's. Dawg53 can correct me if I'm wrong. Here is a video of a chicken with gapeworm, and it's not pretty: https://www.backyardchickens.com/t/831466/hen-breathing-very-heavily-advice-video-included