I'm not knocking the product & if they work for your flock that's great. I had some feather picking going on & still do. I put the peepers on & left them on for weeks. The feather picking still continues. Most of my chickens were pecking the feathers around their vent area. Now, I noticed feathers missing on their backs as well. I thought it was the roo. I'm sure some feather loss on the back is from the roo but I noticed the other day one of my hens picking feathers from the back of one of my girls as well. I have put some saddles on a few girls. I wish I knew how to stop this behaviour.