Those sites are based on the person posting its opinion. So to go around saying Pine is bad is not good on your end as you have nothing to back it up with Legitimate study.
If it was soo bad for rats to be on pine or mice on pine, then why is it that 99% of large breeders of rodents ALL use pine and never have problems with production or deaths. Hell i got rats who are 4 years old like i said kept on pine their whole lives.
Sorry but youll have to do better with the links as anyone can post information like that on a .com. I want to see ACTUAL scientific study proving its bad for them. You wont find any as labs use pine as well