We had a chicken recently with a very similar problem. Very swollen abdomen which was very warm, with messy green poohs, and waddled about very slowly or sat down. No interest in food or water. I tried everything like warm water baths and vaseline to no avail. Kept her in a crate separate from the others in case it was infectious. After 3 days with no change in her condition a vet visiting the horses next door came and had a look and did an internal examination to see if she was egg bound but decided she wasn't. However, the shock of the examination sent her into spasm and she died suddenly, just like that, which was quite a relief as she had been looking incredibly uncomfortable. When it was all over I decided it would be stupid to waste the opportunity of a post mortem to see if I could actually find out what had been wrong. As soon as the abdomen was opened, what looked like gallons of clear, yellow, odourless urine gushed out, and once that had gone her whole body returned to normal size. However, the interesting part was an enormous yellow, oval mass that had been floating in this liquid - it resembled cooked egg, no shell, and was approx 12 x 7 x 7 cms - far far too large to have come out by natural means if she had lived. When sliced in half, the yellow mass looked like layer upon layer of lightly cooked egg - I reckon it may have started off as an egg bound problem, then just got bigger and bigger. But there was no sign of infection, or any bad smell. No guarantee of course that your hen is suffering from the same thing, but it does sound very similar. Mine was a black rock hybrid, about 2 years old, and as far as I know she had been a good layer before this. Good luck, but if yours continues to be enormous and swollen for much longer I think you might have to call it a day - Tamsaddle
