The hen that had this poo has become progressively more lethargic. She's still moving about the lawn, but not nearly like she normally does. she still eats ok. It has been pretty warm the past 3 days but today the temperature should be much cooler. This hen has never been a consistent layer, but it has been about 8 days since her last egg (she's our only white layer). Her eggs have been a bit thin-shelled despite free access to oyster shell. I did not feel any egg down there yesterday. We had to cull our other Ancona 3 weeks ago after similar symptoms (that were more severe) and when I necropsied her, the only remarkable finding were a bunch of cyst-like structures in the viscera around her intestines. We still don't know what took her down We had wormed that hen with fenbendazole with no improvement. The Ancona we culled had never laid an egg (despite being 6 months old). Any ideas? Could egg yolk peritonitis could cause this in the current hen, since she had been previously laying thin shelled eggs. Our other 5 ladies are doing fine and are laying machines. All our hens were vaccinated for coccidiosis & Marek's as chicks. They free range and are fed an organic diet.