I recently introduced a 6 month old rooster to my flock of 14 hens/pullets ranging from 6-10 months. They are all laying except a couple of the younger pullets. My 10 month old barred rock now looks like a naked neck. I guess she is being over mated. Today I noticed a bloody egg. It looked like drips of blood. I separated the roo although he is just on the other side of the run. Another 10 month old had blood from the back of her head running down the side of her neck. I'm assuming the blood on the egg came off her. My hens have never fought. I'm assuming this is from the rooster being too aggressive mating? Is this a correct assumption? What should I do?