My favorite hen, a little silkie, died this morning and I have no idea what happened. She seemed normal when she came out of the henhouse yesterday morning, and my husband is sure she was pecking around the yard during the day. But yesterday evening when it was time to go to roost I saw her hunched in the yard not moving. I picked her up and looked for any sign of trauma or prolapsed vent but didn’t find anything. I put her in the henhouse and she spent the night on the ground in a corner. This morning I put her in a cage to bring her in the house where I could better examine her, but as I started to go inside she suddenly seized, flopped around for a few seconds, and died.
This hen had a prolapsed vent about six months ago that I treated, and she seemed to recover completely. Because of this, I suspect there was some problem with her reproductive tract. After she died, I examined her very closely but couldn’t find anything–no prolapsed vent, no egg stuck inside, no obvious sign of infection. Can anybody tell me what could have happened?