Developed by Professor Emeritus Robert Hawes, with Extension Professor Richard Brzozowski. Reviewed by Professor Emeritus H. M. Opitz. Updated by Extension Professor Gary Anderson. For information about UMaine Extension programs and resources, visit extension.umaine.edu.Find more of our publications and books at extension.umaine.edu/publications/. Table of Contents: Beginnings Strains or crosses for egg production Strains or crosses