Do y'all use Sevin dust on your chickens? What strength? I've read conflicting info...to sprinkle sevin on them & I've also read not to have any sevin dust powder anywhere in the bedding for them to peck at or possibly eat. So, is sevin dust safe for chickens? Even what falls into their litter from treating them while on the roosts? Do you use sevin dust only when they actually have lice or mites or even just in case they do? Can you just sprinkle it on their back or something & they will get it spread around where it needs to go while preening and/or dustbathing? Or, do you sprinkle it on & rub it into their feathers?