James McGuire from Harrow Weald in North London, has a two-year-old daughter, Sophie, who will take part in the trial.

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"In some cases, we can get four football fields of skin out of one baby foreskin, " said Dr. James McGuire, head of wound management at the Foot and Ankle Institute at the School of Podiatric Medicine at Temple University, in Philadelphia.

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But referee Ben Thaler referred the try to video referee Richard Silverwood, who deemed that the Crusaders' Jordan James had purposely collided into Danny McGuire in the build-up to the score.

BBC: Leeds 28-6 Celtic Crusaders

Smith had rested several players - including Danny McGuire, Leon Pryce, James Graham and James Roby - to give fringe players such as Rob Purdham, Mickey Higham, Paul Sykes and Jamie Jones-Buchanan a chance to impress.

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Leeds trailed 14-19 at the break after Scott Donald and Danny McGuire's tries were eclipsed by scores from Steve Tyrer, James Roby and Paul Wellens.

BBC: Leeds 38-19 St Helens