I read somewhere-probably here, 'cause I rarely leave here- that Sevin should not be used for chickens. No idea who or why; just FYI
YES do not use sevin! It is banned for use in poultry, and the egg withdraw is lifetime! (If you have used it once, yu should nevery eat that bird's eggs again)
I think its a bit overkill, but you still shouldnt use it.