I'm trying to set out a startup/two-month budget here, so thank you in advance for an answer. How long will a bag of 5.5 cu. ft. of fine pine shavings last for 8 chicks? Also, I'd just like to be sure that that kind of shavings is recommended rather than these (as they're a better deal). While I'm at it - is it true that a plastic bin is not a good idea to use as a brooder? It's supposed to cause respiratory problems, but I'd like to verify as, quite honestly, a plastic bin seems like a much better option than a cardboard box, and it's more convenient than a metal tub.