Praziquantel only needs to be given to birds showing tapeworm strands and/or tapeworm segments in feces. The vector for tapeworms in poultry are infected insects that have consumed eggs expelled from the tapeworm segments.
Not all insects are tapeworm infected, which is a good thing.
Praziquantel is given once, then repeat in 10-14 days.
I agree that a small quantity of praziquantel should be given to smaller birds.
For example; dosage for Equimax, which contains Praziquantel and Ivermectin is 0.03ml per pound of weight or 0.15ml for a 5lb bird.
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