Since your chickens are 3 years old, I would probably go ahead and give them a dose of Safe guard (fenbendazole) and start the Corid. If you think those white specks in the poop are tapeworms as Dawg53 has pointed out, you will need to give the SafeGuard for 3 days in a row--is that right Dawg? Again, if you think you have tapeworm, the SafeGuard dosage may need to be increased to 1 ml for 3 days, instead of 1/2 ml for 3 days.
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