I tghink you would be surprised at just what your birds are harboring if you had a fecal check done. I run fecals once a month , as I have a very good microscope. Parasites, both internal and external , stunt a lot of birds. Fenbendazole is used on humans in third world countries too. We use the eggs with no problem, but I would not sell eggs for 30 days.On a side note, I have used fenbendazole to deworm my dog and cats and it worked perfectly with no side effects except one angry cat. I've always been too scared to try it with my chickens though since I eat their eggs and may eventually eat them too.
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