Dr. James Earl Kennemer of the NWTF provided some of the info, I will get the author of the articles name once I locate it.
DR. James Earl K. wrote a couple publications on studies in the late 80's and early 90's, both him and his wife. Both books are hard to find and are collectable. He has done many other studies and publications since. I think he has been studying turkeys for the last 30 + years. Some intersting reading.