I have a chick who has legs that are twice to three times as big around as my others of the same age and breed. It's legs are as big around as my 2 year old roosters, who is five times as large as the chicks. What is this a symptom of? I suspect I had bad feed to start with and have changed it to a better brand. Does anyone know what this is, and how I can treat it (if it can be treated)? Thanks!