I have 6 chickens in a house with a yard that we move so they have fresh ground every few days. I have been feeding them a lot of garden vegetables over the summer. They regularly get layer crumbles and oyster shells free choice. Lately one of the hens was feeling off for a few days, continued to lay eggs. She laid an egg or two that was slightly bloody on the outside but not too bad. Now she acts fine, eats well and is active but has wet feathers around her vent and manure sticking to her butt. Yesterday I washed her butt off with warm water and dishwashing soap and gave her a little yogut which she ate freely. Today, her butt is the same. I am not sure what is causing this. Does anyone have any ideas?