What is BST and rBST?
BST is the naturally occurring hormone in cows that stimulates lactation. It is impossible for milk to be “BST free.” rBST, on the other hand, is the synthetic hormone that is supposedly identical to the naturally occurring hormone. If you give it to lactating cows, it can increase milk production. Shamrock Farms does not use the growth hormone rBST on any of our 10,000-plus cows – organic or otherwise. Never have. We just don’t believe in it.