I just discovered my seramas have lice and one I recently purchased in a pen by himself has leg mites. I dosed them all with ivermectin pour on for cattle. Questions: When do I dose again? Can 6 week old chicks be given ivermectin? (They are in a brooder in same room as seramas.) Is it safe for call ducks? They are in a seperate pen in same room. I gave them each a drop. How much is too much? I gave 9 seramas, that were supposed to be wormed a week ago a drop or two of ivermectin. They are new and not sure what they were wormed with. They are seperated but did see bugs. What else should I do? These birds are all in off the ground pens in a large screened in room.