if you do a search on this site - up there where it says SEARCH the first thread to pop up has a wonderful photo of a blood ring. Also I'm pretty sure google has a few listings for poultry science departments that have done extensive research on chicken embryology that will tell you all you want to know about this issue. If they aren't experts I have no idea what you are looking for. Have you at least learned something from this that is is called a blood ring, not a blood LINE? No wonder no one answered your post, I was trying to be helpful.