WindingRoad
Crowing
Chickens rarely over eat.Quaicken108, thanks for your reply.
I can answer some of your questions.
They have not been laying for many weeks. The symptoms have come on over the course of about a week.
Presently their crops are normal. The birds eat some food. We limit the amount so that they don't overeat. Within several hours the crops are emptied.
Their vents look relatively normal, maybe slightly distended as their abdomens are swollen and firm.
Their excrement is a pool of clear liquid with small greenish and whitish blobs of material included. Yesterday there was about a half cc of blood on the floor. This was certainly not from an injury; it was part of a defecation.
Hope this has given you some more leads.