Hello. Have a chicken with a milky white sack hanging from the vent area. It appears mucous-like with no blood. Have looked at many posts to find info on this without success. Is this part of what prolapse is? She went through a strange thing about a week ago where she was lethargic and didn't lay for 4 days. She finally laid an egg and has been fine ever since. She is eating/drinking and acting fine. Any help is appreciated.