I have a small flock of chickens (Silkies with some Polish X and egg layers). I noticed a lice infestation after adding a few young Leghorns to the flock. I know I know, I thought I checked them for lice before I added them but apparently I missed a few A poster on here suggested getting liquid Permethrin and diluting it a lot and just dunking the birds in a small bucket of it (obviously NOT letting their heads touch) so I did that with a few of the really badly infested hens and just sprayed the rest. Now two of my roosters are acting sick. One of them had a really red butt (not normal for a Silkie) and their crows are really weak. It almost sounds like they can't even cluck or crow. Could the red butt just be a reaction to the lice and then the spray? Should I be concerned? Do you think this even has anything to do with the Permethrin? Could it be a respiratory infection? How do I treat a respiratory infection? What should I do?? Please help Carl and Homer I've had these guys for 4 years.