Chickens are basically allergic to cedar. If it's highly aromatic, it can cause respiratory distress. By the same token, pine is an issue IF it is not dried well. I opened a bag of pine shavings and it smelled strongly like disinfectant because it was packaged while damp, I believe. ANYthing aromatic can be harmful to chickens in high dosages or in coops without adequate ventilation.
http://www.poultryhelp.com/bedding.html
http://www.poultryhelp.com/bedding.html
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