bST is a hormone that is naturally produced in cows' pituitary glands (Asimov and Krouze, 1937). bST is a homeorhetic control that coordinates the metabolism of many tissues in dairy cattle. It is scientifically known both as bovine somatotropin (bST) and also as bovine growth hormone (bGH). Among other effects, it triggers milk production in cows' mammary glands. Although bST was identified over a century ago, the high cost of its production restricted research and practical applications until recently.