Bovine somatotropin or bovine somatotrophin (abbreviated bST and BST), or BGH, is a peptide hormone produced by cows' pituitary gland. Like other hormones, it is produced in small quantities and is used in regulating metabolic processes. it became possible to synthesize the hormone using recombinant DNA technology to create recombinant bovine somatotropin (rBST), recombinant bovine growth hormone (rBGH), or artificial growth hormone. Four large pharmaceutical companies, Monsanto, American Cyanamid, Eli Lilly, and Upjohn, developed commercial rBST products and submitted them to the US Food...