I have two chickens who are two years old and they both have yucky bums and what looks like prolapse. We have never had a problem like this before and I'm not sure what to do. Why would two birds prolapse at the same time. We have a rooster that we got about a month and a half ago but have never had a rooster before. Any ideas that can help save my birds and prevent the rest from getting this? Thank you! Please Help!!!