I must have strange chickens because mine gobble it up. I feed them layer mash, black oil sunflower seeds, scratch w/ the wheat kernels in it (I tell you all this so you will know they are not vitamin deficient), and treats and the oyster shell..these are all standard fare (they are penned, not free-range..in a dirt bottom coop) and they eat nearly all of what they are provided,, every day...now you know why I brag about the big, fat chickens all the time, loL! I have 12 hens and average 9 eggs a day. I throw the oyster shell and the BOS on the ground with the scratch, by the way, dont know if that makes a difference...