Posted on April 20, 2015 by Allison W.Supplementing Your Chicken’s Diet Oyster shell. Grit. Scratch grains. So many choices – but what do your chickens really need, and when? Find out below! Click the image to enlarge. Related PostsFeeding Scratch Grains to ChickensHow Much Do Chickens Eat?Why Feed Oyster Shell to Chickens?Why Feed Grit to Chickens?