Hi, A lot of my chickens are losing their feathers. They are missing from their faces and others from their backs and wings. We only have hens in the run so no roos to be pulling them out. I am wondering if it might be a parasite? They are due for a dusting which we do about 3 times a year but have never seen a feather issue like this before. Thank you for any help or suggestions anyone has. Jennifer Porter.