Who is "they?": I have heard these internet rumors too, but as far as i can tell from a search of medical literature, no one in the medical community has connected animal growth hormones (the most common one in the media is bovine growth hormone used in cows) to precocious puberty. Precocious puberty has several known causes and this isn't one of them. Even if this was a cause, the answer would still be no.
Answered 7/20/2012
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