Originally Posted by Zereh
Of course what an animal eats is passed along to those who later eat the animal. That doesn't take any kind of degree what-so-ever to figure out.
That doesn't mean that whatever the animal ate has effects in those who later eat the animal. Bovine growth hormone is inactivated in humans by digestion; it has no effect on people. In fact, the government did experiments many years ago trying to determine whether BGH could be used to treat dwarfism in humans; it didn't work.
From bST and Milk
(North Carolina State University):
Early clinical researchers studying bST (bovine somatotropin) were hopeful of its usefulness in treating human dwarfism. However, though the protein could be safely injected into humans, it was not biologically active. Growth hormones are species-specific. Since it is a protein hormone, it is digested by humans into peptides and amino acids like any other protein. In fact, when presented to a cow orally, bST is not active. The cow's digestive system simply recognizes it as dietary protein.
I've also read that, since this hormone is made naturally by cows anyway, there's no way to tell from their milk or meat what is natural and what was added.