DG is Decomposed Granite. Garden/Yard centers are very familiar with it, as are construction sites. It's used as a base under pavers, walkways, patios, etc. The stuff is ground up granite, from small bits down to crunchy sand. Sharp edges, not rounded like pebbles. Compacts very well as a base for patios, etc. And would be just fine for chicken grit!
I use construction sand, or "all purpose" sand. Not play sand - that's too fine. I just buy a 50# bag of it now and then, replenishing the sand in two plastic "dust bath" pans, and throwing the rest on the ground in a particularly sunny spot. (The plastic pans with sand are tucked under covered areas, so the chickens still have a place to scratch and flap even when it's raining.)
As for oyster shell, I bought some the other day, but I'm not putting it out unless I see a problem with soft eggs develop. Just wanted to have it on hand, in case it should be necessary at some time.
I use construction sand, or "all purpose" sand. Not play sand - that's too fine. I just buy a 50# bag of it now and then, replenishing the sand in two plastic "dust bath" pans, and throwing the rest on the ground in a particularly sunny spot. (The plastic pans with sand are tucked under covered areas, so the chickens still have a place to scratch and flap even when it's raining.)
As for oyster shell, I bought some the other day, but I'm not putting it out unless I see a problem with soft eggs develop. Just wanted to have it on hand, in case it should be necessary at some time.