Has anyone ever had glucan blockage in a chicken caused from oatmeal? Anybody have any health problems after feeding oatmeal to chickens? Nope. That's because it doesn't exist. There is not one documented case. I've had chickens for 43 years. I've never seen a chicken get sick on oatmeal or oats, and nor has anyone else. And we feed our flock up to 50% whole oats every day. The pictures that the chicken chick has on her blog showing the effects of oatmeal are fake. And the study she claims proves it, isn't even a real study. The whole thing has already been debunked. Go to the BYC facebook page and ask around.