You may want to look into Redmond's Real Salt, which is sometimes carried as rocks by the more natural minded feed stores, and is also sold as "The Trophy Rock" for a natural salt lick for deer. Here is more info and an online source: http://wolfcreekranch1.tripod.com/redmond.html
Shortly after we got our first 2 jerseys, we were feeding an organic loose mineral and found that the cows starting eating their shed. My husband mentioned it to the feed mill guy, and he sent him home with the standard salt block. The cows started licking the thing and wouldn't stop... they started blowing up with edema so we took it away late that afternoon. The edema lasted for several days, and their udders were rock hard and very difficult to milk. Then we bought a Real Salt rock, and they licked it, but they seemed satisfied and walked away after a few minutes. WIth the Real Salt rock, they completely stopped eating their house and had no edema whatsoever. We've been feeding these to all of our animals ever since (for the past 4 years), and are very happy with them. Meg
