A cystic right oviduct, sometimes called persistent right oviduct happens when the right ovary does not atrophy and shrink away after birth. Normally hens only have a left oviduct remaining, but if the right oviduct does not shrink away, they can collect clear fluid inside a membrane. Many times this can be due to the chick being exposed to infectious bronchitis virus early in life. It is hard to know what is causing an enlarged belly until a necropsy is done after death.
Unless you have obtained clear colorless fluid before, I would suspect ascites or internal laying/egg yolk peritonitis. Ascites fluid is always yellow to deep amber, to almost green in severe cases, from bile. The only time that I have intervened and drained a hen with suspected ascites is when my favorite pet bantam had sudden labored breathing. She still passed away in 2 weeks from the reproductive problem that caused the ascites.
Unless you have obtained clear colorless fluid before, I would suspect ascites or internal laying/egg yolk peritonitis. Ascites fluid is always yellow to deep amber, to almost green in severe cases, from bile. The only time that I have intervened and drained a hen with suspected ascites is when my favorite pet bantam had sudden labored breathing. She still passed away in 2 weeks from the reproductive problem that caused the ascites.
Last edited: