Research funded by the Australian Egg Corporation has found that stress levels in chickens are not determined by production type - and 'free range' hens are just as likely to be stressed as those in cages or barns,
What the researchers don't explain in their report is what were the comparisons between the production facilities they used. Were the so-called 'free range' hens from intensive systems where the hens were run at high stocking densities and were beak trimmed. Its almost certainly the case that they were, and if so, it's just another example of research designed to produce a pre-determined result.
http://www.smh.com.au/environment/animals/freerange-no-winner-over-inside-scramble-20120322-1vmx9.html
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