I've had chickens for about 5 years also. I had researched and read a lot about plucking feathers about 5 months ago because for the first time, one of my girls started doing it. I originally thought she was only plucking, but after reading the information and a taking closer look at what she was doing, I realized she was plucking and eating them. She was receiving high protein food as well as mealworms. However, I was also giving her a fair amount of bread because she loves it so much. Unfortunately, I had to take away her bread for the most part, but it did stop once I did. Good luck.