Uncowed: chemicals in food. (bovine growth hormones) (American Survey)

COULD it be the opening scene of "Jurassic Park II", the sequel? The camera homes in on a grocery store, where you see a large cow angrily pouring out jugs of milk and yogurt while stomping on cheese and butter. It is biotechnology run amok.

Cut. In reality you are watching a "milk dump" organised by the Pure Food Campaign to protest against the use of a genetically engineered growth hormone known as bovine somatotropin (BST). There have been 73 such events to date and, as the man in the cow suit will tell you (he has now taken off the head and is handing out leaflets),…