Dont get me wrong because I’m no expert in this at all. I’m afraid it is a large infection and life threatening and I don’t know what you can do about it.
I had a hen who laid soft shell eggs once in a while. One day she got a bloated abdomen like your chicken. Just not so much at the vent area. More in front and between her legs. She got very ill and died within 2 days after noticing. I only could give her a comfortable nest (a box on the ground) the last day with some mash food and water in front of her. The other chickens could visit her but here she was not disturbed.
I’m sorry I have no cure. I hope someone else has or that this will pass.
I had a hen who laid soft shell eggs once in a while. One day she got a bloated abdomen like your chicken. Just not so much at the vent area. More in front and between her legs. She got very ill and died within 2 days after noticing. I only could give her a comfortable nest (a box on the ground) the last day with some mash food and water in front of her. The other chickens could visit her but here she was not disturbed.
I’m sorry I have no cure. I hope someone else has or that this will pass.