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The DD Gene
Victoria G. Myers Progressive Farmer Senior Editor
Mon Sep 30, 2013 09:39 AM CDT

DNA samples from calves born with a rare condition where extra limbs originate from the neck or shoulder area, have led to the identification of an inherited, simple recessive condition, known as Developmental Duplication or DD. A common term for animals or humans born with additional limbs is polymelia.

Phil Trowbridge, president of the American Angus Association, said in a letter to association members that he expects they will use DNA testing to deal with the condition in a strategic manner, but fell short of calling for mandatory testing. He said this policy "represents an evolution in the association's approach ...

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