I started keeping chickens this spring and have been using pine shavings in the coop. Now that it's colder and I have the big windows closed, I find it's kind of dusty in there in the morning before I let them out. The coop has plenty of ventilation, even with the big windows closed, but they scratch around in the shavings, of course, and that stirs things up more than I anticipated. Do others have this problem? Is straw a better bedding? I have straw in the run, but I thought the shavings in the coop would be better because they're so much more absorbant.