Here's why:
* bST is a synthetic version of the naturally occurring hormone somatotropin, produced by the pituitary gland in cattle.
* rBST is a genetically engineered form of bST produced in the laboratory.
* Growth promotion: When administered to cattle, bST/rBST stimulates milk production, increases muscle growth, and improves feed efficiency.
It's important to note that the use of bST/rBST is controversial, with concerns regarding its potential health impacts on both animals and humans.