My 5 month old rooster just died. He had the collar over a month.He was healthy and we thought everything was fine he would try to shake it off and the 3 hens would peck at it gently trying to get it off. We thought we were careful and followed instructions. We watched him and he could breath fine and open his mouth. We had a necropsy done to be sure of what happened so it won't happen again. The doctor said he aspirated he had some food and foam in his trachea. His comb was also swollen 3x normal size, we did not notice. It's our first experience with chickens. He was our pet my son cried. I just want people to be aware. I think if we loosened it anymore he was too loud. He just had a faint crow as loud as the chickens. I tightened his collar Saturday and he was fine we are with them daily. Tuesday morning we checked on him he was fine. I came home at noon looked out the window immediately to check on the chickens I saw him laying on his side dead. I'm not blaming anyone I'm just hoping this post will help someone from going through the same thing.