I'm currently trying to decide what to include in my homemade feed mix. Harvey Ussery suggest, in his book "The Small-Scale Poultry Flock", to include either aragonite or limestone to increase calcium availability. I bought two products made by Espoma, organic Garden Lime and organic Garden Kelp. The lime states that it is all natural & pelletized, about the size of a red lentil--only round--and that it is safer than hydrated lime. The kelp is a bit larger but no much. If anyone knows if these products would be safe in feed, please share with me. I'm also looking for a low tech method of grinding grains for a micro flock of six. I have an old fashion iron grinder that I've used for making ham salad; will this work or will it be too labor intensive? Thanks for reading this post!