Zoo Performs First Reverse Vasectomy on Horse

Scientists at the Smithsonian Institution's National Zoo have revealed they reversed a vasectomy on an endangered horse to allow it to reproduce naturally--the first-known operation of its kind on an endangered species.

Veterinarians said Monday that the surgery was performed in October 2007 on a Przewalski horse named Minnesota.

Luis Padilla, DVM, the zoo veterinarian who performed

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