The use of the Stone Henderson Equine Castration Instrument, which allows veterinarians to geld colts using an attachment on a battery-powered drill, has gained speed since its debut at the 2005 American Association of Equine Practitioners' Convention. John Steiner, DVM, Dipl. ACT, of Hagyard Equine Medical Institute, reviewed the tool's anecdotal reports of successful use during the Hagyard

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