Well, 3 days after starting the oyster shells and ACV in the water....we have a solid-shell egg!! Yes, it was sorta thin-shelled, but I think that we are on the right track. Also, I give them plain yogurt 3 times a week or so....they love it and it also helps with their digestion, gives them calcium and protein as well as I am sure that it helps cool them in the Texas heat.