Here is a link to some research hot off the presses.
http://www.ltz.de/en/news/lohmann-information/4.Ruhnke_Free-range-egg-production-in-Australia-2_2015.php
It's a very long article on the state of "free range" production in Australia. Free Range production is more difficult than cage egg production with a lot of special problems very well set out by Dr Isabelle Rubnke in her analysis.
