Hello! I have 15 hens. Rhode Island Reds, Barred Rocks, White Leghorns, Ameri-Auracana, Buff Orphington, Black Austrolorp, Jersey Giant. They were all hatched approx April 1st 2016. (they are about 13weeks now) I have had the nest boxes blocked off this whole time so they didnt get into a habit of sleeping in them but Im not sure when I should allow access and start providing bedding for them. I have the flooring as pine shavings.. I didnt know if pine shavings are ok in the boxes also or should I use something else? Any help is appreciated! Thank you!!