I see @Eggcessive already posted this link but I'm going to add it too. This article actually saved my rooster! I also now use a chicken bra on him. Read and re-read this article. As far as I'm concerned it is gold.
https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/
https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/