This is more geared toward caged birds, but it has some fabulous material in it, easy to read:
http://www.caribbeanpoultry.org/pdf/Table_School_2004/CPAEggSchool2004_JBrown_Layer&EggQuality.pdf
http://www.caribbeanpoultry.org/pdf/Table_School_2004/CPAEggSchool2004_JBrown_Layer&EggQuality.pdf