I spoke to the vet, who was not very helpful as most vets do not tend to very many chickens. I have 3 laying hens who are 7 months old that are all of a sudden bleeding from the vent. They have all laid their eggs today, and are pooping ok. I was finally able to pick one up and clean the area a bit, I say a bit because there is a lot of old/new blood there. The vent seems to be swollen/blue tinged. They are all eating/drinking and acting normally, just the bleeding. I am stumped. Any suggestions? It is cold enough to snow but they are in a heated henhouse at night. Nancy in Canada.