In a 2004 Scientific American (July issue) article titled, “Gene Doping,” H. Lee Sweeney describes the “Belgian Blue Bull” as the bovine version of the Incredible Hulk. The Belgian Blue Bull is a freak of nature because an inherited genetic mutation in the breed deactivates both copies of the gene that encodes myostatin, a protein that inhibits muscle growth so the organism can maintain a balance between muscles and skeleton. The absence of this protein not only allows unchecked muscle growth, it also inhibits fat deposition. As a result, this bull has incredible lean muscle bulk—a bigger, stronger, and, yes, faster bull.
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