I found out that a local mill sometimes has screenings for sale for cheap. The screenings are left over from the milling process for grains. The mill has all kinds of grains. On the phone they said it was a mix of hulls, dust, and whatever particles are too small to meet guidelines for food grade. I've tried to google but I can't find much info. Would this be suitable for chickens to eat, either (mixed for proper ratios regarding protein etc.) or as scratch? Any ideas?