This line of inquiry usually devolves into a lot of humor, but please humor me for a moment before the fun starts. Several of my hens are getting swollen bellies. I took the first one to a vet, expecting egg peritonitis or ascites or such, She took an x-ray and found lots of gas in her gastrointestinal system, but had no idea what the cause could be. Now another one is swelling up and she's actually passing gas. I pick her up and out it comes. A lot. Every time. She is also having trouble laying eggs. Takes her hours, and she seems miserable. It seems impossible to find anything serious online about this as most info that comes up is either joking or about humans and dogs passing gas after eating chicken. I did find this, though: "Birds don't typically need to pass gas, but their bodies allow it should the need arise. It's not that they can't. They just don't need to, says Mike Murray, a veterinarian at the Monterey Bay Aquarium in California. Birds have the anatomical and physical ability to pass gas, he explains, "but if I saw gas in a bird's gastrointestinal tract on an x-ray, I'd suspect that something abnormal was going on in there." Birds don't typically carry the same kinds of gas-forming bacteria in their gut as humans and other mammals to help digest food, so there's nothing to let loose. " http://www.popsci.com/environment/article/2009-05/it-true-birds-cant-fart Does anyone have thoughts on what is happening and how I can relieve the misery these girls are enduring? Could it be necrotic enteritis? Would an antibiotic help? If so, what would work on this type of intestinal bacteria? Thanks!