I got this bright or not so bright idea, depending on what y'all say but I figured since chickens ingest pebbles/sand for grit that I would use the little pebbles from in front of our driveway. Mentioned it to my hubby and he's concerned because our road is asphalt which, I guess means that the little pebbles may be asphalt with tar on them. Do you think this is a problem? I put about 1/8 cup in about 10 cups of feed. Any ideas please...snickering is allowed for you chicken pros and yes, I am blonde!