I lost one hen yesterday, I am not sure what from. She was very week when I found her on Tuesday. She was fine all weekend. She was laying on the ground and did not get up when I opened the run door. I picked her up and sat her outside where she moved along. Later I found her lying down again. When I picked her up she slumped over and water poured out of her beak. I noticed she felt light and her craw was empty. I sat her aside in an isolated pen with water and food. We did give her a dose of Vet-Rx. That evening her breathing was very labored, I was confident she would not make it through the night. I was correct when I found her the next morning. I am not sure how long there were any symptoms, none that I noticed. I plan on giving Rooster Booster to the rest of my flock and a dose of Vet-Rx tomorrow. Does anyone have an idea what this may have been? Anything else that I can do for prevention?