what is the bovine growth hormone?
<answer> A genetically engineered copy of a naturally occurring hormone produced by cows. <context> Recombinant Bovine Growth Hormone is a genetically engineered copy of a naturally occurring hormone produced by cows. Manufactured by Monsanto Company, the drug is sold to dairy farmers under the name POSILAC, though you'll also find it called BGH, rBGH, BST and rBST.