I have a mix of 17 hens - GLW, SLW, BR, BO, BA's Leghorns and EE's that have been doing terrible feather picking for about 3 weeks. One of my BA's has a bald bottom and back. The SLW and GLW's are ruthless with cornering and pecking the bottom fluff feathers. All are laying with the exception of my EE, that seems to be in a slump - she hasn't laid an egg for almost a month. She is also one that gets picked on. I have changed their mash to Blue Seal Layer Crumbles, have added black oil sunflower seeds, dry cat food and wet cat food to increase their protein level. How long does it usually take to recover from a deficiency like this? It is starting to get cold and my BA is bald Is there anything else I can do? Does this also have to do with doing a mixed flock? I would love to hear from all you chicken lovers.