Honestly, I think the experience of all the people here outweigh the supposed "scientific studies". We have people here who have kept rats and mice on pine for decades. These studies were probably conducted over the course of weeks, if that long.
I have always used pine. I have never had an issue with it.
I think there is plenty of sufficient research done to say that kiln dried pine is safe. The fact that people keep rodents on this bedding for decades and the fact that people can keep their rodents on it until they die of old age is sufficient. Rats don't live very long, what, around 2-3 years. Thus, if the rodents can live in pine for 2-3 years without issues, pine is safe.
I'm sure, on this forum, there is more combined knowledge on the subject than actual "scientific" studies.
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