I have a flock of 12 birds. A mix of breeds. I have noticed over the last few weeks that some of the birds are loosing the feathers to the front of their neck, some loosing all the feathers on their neck and parts of the head. I thought at first that they might be malting. But am wondering if some birds are eating the feathers for protein. I have recently purchased a higher protein mix but have not seen an improvement yet. Any ideas welcome.