Found this article, and thought I would post it for basic information. Mentions some heritage birds good as layers. This article is old 2002, and isbefore the increase in poultry and the improvements since that time. Also Coccidia vaccine is now available.
http://www.mofga.org/Publications/M...r/Summer2002/BobHawes/tabid/2091/Default.aspx
http://www.mofga.org/Publications/M...r/Summer2002/BobHawes/tabid/2091/Default.aspx