I have a 2 year old leghorn hen. she has always had an issue with a dirty butt. she is an excellent layer. recently she laid a huge egg, the next day she had vent prolapse. the huge egg had a bloody tinge in the white. I brought her in and soaked her in warm water. tried to put her tissue back in but was not possible cause it was out really far. I put prep H on it and put under heat and in the dark. the next day she had punctured the big bulge and it was bleeding. so I tried putting it back in and when I pushed on it this little bubble popped out of the puncture area. it was the size of a large marble and it was like bloody white part of an egg. after that I was able to push everything back in. I kept her inside for a week. she's eating well, drinking out and about but hasn't laid an egg since then. that was about 3 weeks ago. now she has black sticky smelly stuff on her feathers on her butt and it has seeped into her tail feathers. I should say she is in with my silkie pullets so she has been eating a mix of starter/grower feed and layer feed. the reason she is in with my silkies is she's blind and the big girls would pick on her.