I have an almost 2 year old cuckoo maran who has a host of issues. I noticed one day she had some crusting on her vent. I picked her up and she felt bloated. My wife held her over the sink while I put a warm wash cloth on her backside and began to pull the crusted poo off of her vent. As soon as I pulled the last piece off, she had explosive (I really mean explosive, my wife was so startled she almost dropped her) poo followed by a trickle for a few minutes. We cleaned her up, put some vaseline on her vent, gave her antibiotics and let her rest for a week segregated from the other chicken. She still had a little bit of runny poo but we cleaned her again and let her back with the other hen. About a week later I noticed she had crusted again. We clean her, this time with no explosion. A few days later I noticed she looked crusted and really swollen. We cleaned her vent, and she let out some built up poo. I pressed on her stomach and egg came out, followed by more poo, with more runny bubbly poo to follow. When the egg came out, her vent tore about 1/4" near the top. She is back to being secluded with antibiotics. Any suggestions on what to do? Thanks.