When medication is given, the dose list is almost always written as mg/kg. which means number of milligrams per kilogram to give.
The low dose you are talking about is 1 mg/kg, right?
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The two types of fenbendazole you are talking about are Aquasol & the coat/cow/horse stuff.
Aquasol is 200 mg/ml. That means there are 200 mg of fenbendazole in 1 milliliter.
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The coat/cow/horse stuff is 100 mg/ml. That means there are 100 mg of fenbendazole in 1 milliter.
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Still with me?
One has to ask oneself what worms one wants to treat, pick the dose that treats those worms, and then do a little math.
The math formula is *always* the same:
Weight of bird in pounds, divided by 2.2 (converts to kg), times the dose, divided by the number of mg in one ml.
If you are sure your 5-pound hen does not have any worms other than large roundworms or cecal worms:
5 / 2.2 x
1 / 100 = 0.0227 ml
If you think your 5-pound hen might have capillary worms:
5 / 2.2 x
50 / 100 = 1.136 ml