I read up on it awhile ago. The thinking on cedar shavings or chips is that fresh cedar oil / aromatics is bad for their lungs, so if you were to pile a whole bunch in a coop as bedding that could be toxic. Also especially for chicks in a brooder this would be bad. But some people use some cedar without issues, maybe in sheltered but outdoor runs? If it's old and has lost the oil / aromatics it's better.Remember, we were talking about the green pine needles here....
And you asked about giving them Cedar, too. (see below).
I know you don't use cedar shavings - I was referring to the Cedar branches (green) you were thinking of giving them, or at least asking about. My train of thought was - itf it is bad to use as bedding, I would NOT give them green branches (to eat the needles) of cedar without doing some research first...just to be sure.
It reminds me of the ammonia & poop rule, that their lungs get damaged at some small percentage of what we can even begin to smell. So by my lights it's better to stay away if you can.
I would think fresh cedar greens would be pretty aromatic especially as chickens nipped at it (IF they even want to eat it?) so they might be getting a good dose into their lungs there.
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