I have 10 assorted egg layers and 12 Cornish X that are about 7 weeks old. Since they were a few weeks old I noticed the egg birds picking at the meaties. Now that they have lost their downy fuzz, the egg layers are plucking the breast, neck and now tail feathers off the meaties! I have sprayed Hot Pick on them only to see them(eggers) pick right away. No blood yet but did have a couple bloody necks a few weeks ago that I treated with styptic powder and that worked fine. Why are they attacking their necks/breasts? The egg birds are all beautifully feathered and no picking on them. Odd to me. They are in a 11x16 coop at night and have a large run during the day/evening. I suspect they are bored during the morning and attack then. Haven't seen them doing it outside.