if you read that paper it pretty much proves my point as well and there is nothing in it that substantiates any claim that cedar is harmful to chickens - let alone LEATHAL!
If you read the paper AND the sources it cites, it shows that cedar IS HARMFUL to any animal that breathes the fumes .
"Lethal" may not be the proper term, since that implies it's always "deadly", but theres no evidence that it's SAFE.
It's easy to say "It's not true" but without something to back it up, it's just an opinion with no basis in fact.
Feel free to show any studies that say there are no harmful effects.
I've already shown one you said didnt exist
If the fumes arent irritating, why do they repel moths and fleas?
In fact, if you open this link
http://www.epa.gov/oppsrrd1/REDs/factsheets/3150fact.pdf you will see this comment "natural cedar products which consist totally of cedar wood, are not combined or impregnated with other substances, and are intended only to repel arthropods other than ticks and/or to retard mildew. EPA believes it is unnecessary to regulate these products because they pose little or no risk to human health or the environment.
Consumers are not likely to be exposed to significant amounts of cedarwood dust or oil, either dermally or by inhalation, when using these products. EPA is not aware of any evidence of injury to human health or the environment due to their use."
This is the "proof" you cited, but it doesnt apply to the ANIMALS that are living in direct contact with the chips. The EPA isnt concerned with them. Here's another quote from that same source:
[b]A laboratory study using mice and a study of workers in saw mills
suggest that cedarwood oil may cause liver and pulmonary toxicity.
However, these effects were associated with long term exposures to[/b]
relatively high levels of cedarwood oil. EPA does not expect such effects to
occur among users of currently registered cedarwood oil products because
their exposure is intermittent and at a low level.
Ultimately , the choice to use it is an individual one, but it should be an informed choice based on DATA and not opinion