So I got 50 Black Sex-Link hens back in November. When they were younger we kept them in a chicken tractor in the chicken pen untill they were old enough to be around the older chickens without the worry of them hurting them. When they were in the tractor, they pecked and pulled each other's feathers because I assumed that they were too close. I was never too concerned because I figured that they would grow back To this day, they still have no feathers around their tail. And just a few minutes ago I noticed that one of the hens had blood comming from her vent. Is this a cannablism problem? What can I do to fix it?