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Why are some groups pressing to ban rBGH, the hormone
given to cows that makes them produce more milk?
Cows naturally produce bovine somatotropin in their
pituitary glands, and traces are secreted by the animals when they are
milked. More popularly known as BGH, or bovine growth hormone, BST
interacts with other hormones in cows’ bodies to control the amount
of milk they produce.
As a means of increasing milk production, scientists
working for Monsanto spent years in the lab developing a genetically
engineered synthetic version of the hormone called rBGH, or recombinant
bovine growth hormone. Monsanto obtained approval to market rBGH (known by
the trade name Posilac) from the U.S. Food and Drug Administration in 1993
and began offering it to interested farmers. Today, about a third of
American dairy cows are injected with rBGH, which boosts milk production by
about 10 percent.
But the use of rBGH is controversial because of potential health hazards to both cows and human beings.
According to the Center for Food Safety (and supported by a 2003 study
published in the Canadian Journal of
Veterinary Research), cows treated with rBGH
suffer a 50 percent greater incidence of lameness (leg and hoof problems),
25 percent more udder infections (mastitis), and serious reproductive
problems, including infertility, cystic ovaries, fetal loss, and birth
defects.
Such animal health issues can sometimes translate
into human ones: Antibiotics used to fight infection can find their way
into milk, affecting our disease resistance. Also, animals given rBGH
produce more insulin-like growth factor-1. Studies, says the Organic
Consumers Association, have linked high levels of IGF-1 in people who
consume rBGH milk with breast, prostate, colon, and other cancers. This suggests that our
natural defenses against early cancerous cells are blocked by IGF-1.
Controversy also surrounds the fact that there are no
labeling requirements in the United States for rBGH.
In February 2007, the OCA, along with the Cancer
Prevention Coalition and the Family Farm Defenders, filed a joint petition
asking the FDA to require cancer-risk warning labels on all U.S. milk
produced with rBGH. They also asked the FDA to suspend rBGH approval
because of “imminent hazard.” Analysts doubt the FDA will take
the request seriously, despite not knowing what problems with rBGH might
arise down the road.
Monsanto maintains that human beings digest so little
of the hormone that it has no direct effect on our health. The World Health
Organization, the FDA and numerous medical associations concur that milk
from rBGH-treated cows is safe for human consumption. However, many remain
wary and, as a result, several nations have banned rBGH, including all 25
European Union nations, Japan, Australia, New Zealand, and Canada.
In the United States, despite lack of federal
concern, consumer pressure has led many companies to discontinue the use of
rBGH. In January 2007, Safeway announced that it would go rBGH-free at both
its Portland, Ore., and Seattle plants. Others following suit include
Starbucks, Ben and Jerry’s, and Chipotle Mexican Grills.
For more information:
Center for Food Safety, www.centerforfoodsafety.org; Cancer Prevention
Coalition, www.preventcancer.com; Organic Consumers Association,
www.organicconsumers.org; Family Farm Defenders,
www.familyfarmdefenders.org.
Send questions to Earth Talk, care of E/The Environmental Magazine,
P.O. Box 5098, Westport, CT 06881 or e-mail earthtalk@emagazine.com.
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