Just tossing this idea out there. Not sure if it will actually work on chickens. While visiting a wharf many years ago, they had strung what appeared to be a thick fishing wire about 1" - 2" up above all the fence rails along the wharf. Not a seagull was to be found on the rails, yet we could see them perched on rails on another wharf. A quick google image search on "bird wire deterrent" shows lots of images, but I have not read any of them to see if it works on chickens.
I read recipes the same way I read science fiction. I get to the end and I think, "Well, that’s not going to happen."