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If you're using ivomec injectable, it may be an effective wormer on other livestock, but not chickens; http://onlinelibrary.wiley.com/doi/10.1111/j.1439-0450.1989.tb00635.x/abstract It will still kill mites in chickens. Ivermectin pour on and eprinex have been losing their effectiveness on large...

Use the piperazine first, follow the directions on the label. If you suspect gapeworms, piperazine is useless and you'll need to use flubenvet. (I doubt your birds have gapeworm, as they are not common in chickens.)

Unfortunately you are overdosing your birds by using the ivomec. You may not see it outright, but the damage is done mainly to organs. I recommend only using only one wormer at a time and not mixing them.