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Hello, We have a suburban backyard flock of 6 hens. 4 are 2.5 years old, 2 Easter egger, 1 polish, 1 Wyandotte, and 2 4 month old silkie/Cochin mixes. Prior to getting the silkie Pullets a month ago, we have never had pest issues. After 2 weeks of having the silkies, they had lice. I treated...