i have a 6 month old polis roo that is in with 23 hens.. the hens are picking his head bloody! accckkk! they quit for a few weeks but have started again *sigh* they are in a large coop (20X30) with a 30 ft long run that is 10 feet wide.. they get free choice feed (layer) and occaisonal snacks... they are all healthy and fat . what can i put on his head to discurage them from pecking his poor head??