http://dsc.discovery.com/news/2009/0...-chickens.html
Compared to caged birds, free-ranging hens had more bacterial infections (the most common cause of death), more parasites, and more viruses. They were also more likely to become victims of violent pecking and cannibalistic attacks, the scientists reported this month in BioMed Central's open access journal Acta Veterinaria Scandinavica.
"One of the largest attractions of free-range chickens is that it makes people happy to think about chickens outside pecking at the soil," Porter said. "Although the perception of the general public is that these outdoor chickens must be healthier than others, time and time again this is shown not to be true."
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