We have 7 hens of various breeds. Over the last week or so we've found about 3 to 6 feathers per day in the run and the coop. The feathers are broken off at the base. So far the chicks show no signs of large bald patches or obvious irritation. We have also not noticed any consistent aggressive behavior (beyond the normal establishment of the pecking order). Is this rate of feather loss typical for flock of 7 eight week old birds?