Hi, i was wondering if someone has any information in regards to why one of my chickens (i have 8 in total) would be losing feathers? she has lost all of her tail feathers and all over her body, she has slowly be deteriotering over the last 3-4 months, i have checked her for mites and treated them all for them as well as treated their coop etc, they are up to date with worming. I cant think what else it might be?? i reserched overian cancer but she is still laying eggs i think?? she eats and runs around happily, her glove on the top of her head has decresed in size though, but still can get up on her perch, so still has pleanty of energy. Maybe its diet?? or is she lacking something in vitamins or minerals?? She is the only one out of 8, the others are fine and healthy and have all their feathers. If any one else can shed some light or have any experience in this i would love to hear from you. Thank you.