Update on Using the Pallet Wood Bits and Pieces Turned Into Woodchips
Since I chipped up a 5-gallon bucket (plus another 1/3 bucket) full of pallet wood bits and pieces, I filled my chicken coop nest boxes with the fresh wood chips. What you see here is enough nest box material for about 4-6 months for me...
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I don't know if the hens like harder wood chips, or not, but they are still laying eggs in the nest boxes. In the past, I have used lots of mostly free nesting material including dried grass, leaves, pine shavings (not free), wood chips, shredded paper, and most recently shredded cardboard. It all seems to work but my favorite nesting material is the shredded cardboard.
Again, I was just experimenting with different ways to (re)use those leftover bits and pieces of pallet wood. Turning them into wood chips takes some time in my small woodchipper, so I don't think I will do that again. I did like the suggestion from @ChicksnMore of just using the pallet wood bits and pieces in planters. So, I might be dumping a few buckets full of pallet wood off cuts into the new pallet wood raised beds I built this winter when I set them up this spring as hügelkultur raised beds. That's a better use of that material then burning them in the backyard fire ring.
I avoid cardboard as they make perfect housing for mites. not sure if it is shredded.