The hotly anticipated fight between Floyd Mayweather Jr. and Manny Pacquiao was teetering on the brink of collapse on Wednesday over a dispute regarding drug testing procedures, a debate that has some experts standing on Mayweather’s side.

On Wednesday, Pacquiao promoter Bob Arum of Top Rank proposed a drug testing schedule that would include three blood draws and an unlimited number of urine tests in an attempt to salvage the bout that hit a negotiating snag on Tuesday, when Mayweather’s side insisted on random Olympic-style drug testing administered by the U.S. Anti-Doping Agency. The world’s top two boxers had agreed to meet on March 13 at the MGM Grand Garden Arena in Las Vegas for what is expected to become the largest-grossing bout in the sport’s history.

Arum said frequent urine testing is sufficient in the final 30 days to prevent either fighter from using performance-enhancing drugs. He said Pacquiao is willing to submit blood samples in early January, in mid-February around 30 days prior to the fight and then again in the locker room immediately upon conclusion of the fight.

In the interim, Arum insisted urine testing would be sufficient.

“Everything can be picked up by urinalysis,” Arum said. “Everything.”

Travis Tygart, the CEO of USADA, disputed Arum’s contention and said a combination of blood and urine testing is required to be effective. He also said that to be most effective, athletes would have to be subject to random testing while out of competition.

If any testing is conducted in the Mayweather-Pacquiao fight outside of what is mandated by the Nevada State Athletic Commission, it would be during competition since the fighters are scheduled to start training in early January.

“To have an effective program, you have to collect blood and urine,” Tygart said. “The reason for that is that there are some things that are only detected in urine and there are some prohibited drugs that are both very lethal and potent from a performance-enhancing standpoint that are only detected in blood. One of those, for example, is human-growth hormone (HGH). There is no urine-based tested for human-growth hormone. It doesn’t show up in the urine. It’s only a blood-based test. That’s true of a number of prohibited substances, particularly those that would enhance and aid a boxer.”

Experts told Yahoo! Sports that the amount of blood the fighters would be required to give is minimal and would have no impact upon their performance.

Pacquiao is reticent to give blood within days of a fight because he believes it weakens him, his adviser, Michael Koncz, told Yahoo! Sports on Tuesday by telephone from Manila, The Philippines, where he has been meeting with Pacquiao.

An extraordinarily angry Arum, who had harsh words for Mayweather’s camp, which includes the boxer’s father, Floyd Mayweather Sr., and Golden Boy Promotions CEO Richard Schaefer, said a deal would have to be reached Thursday in order to salvage the show.

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Source: http://sports.yahoo.com