Debate about horseracing drug may be solved with colorado state university and partner research in south africa
DEBATE ABOUT HORSERACING DRUG MAY BE SOLVED WITH COLORADO STATE UNIVERSITY AND PARTNER RESEARCH IN SOUTH AFRICA FORT COLLINS - A study led by Colorado State University and research partners will help to
answer a long-debated question about health and performance effects of a drug commonly used to
treat racehorses in the U.S. to prevent bleeding into their airways as they run. The study, which is a
massive research effort, involves 200 horses in South Africa that will compete in four days of racing
in November. The races have been coordinated for the purposes of the study.
The drug furosemide is widely used in the horse racing industry in North America but is banned on
race days in all other countries. More than 90 percent of racing Thoroughbreds and 50 percent of
racing Standarbreds in the United States and Canada are given furosemide a few hours before racing
to treat bleeding. However, despite this common practice, there is no conclusive evidence that
furosemide is actually effective in preventing or limiting lung bleeding in racehorses - but there is
evidence that the drug may enhance performance for other reasons, making it a controversial
"This study will be the first randomized field trial ever conducted under normal racing conditions to
investigate the efficacy of furosemide for preventing exercise-induced pulmonary hemorrhage in
horses," said Paul Morley, one of the leaders of this study and a veterinarian at Colorado State
University. "Because of the size of this experiment and its design, these results will provide the most
reliable information ever available to guide the highly politicized debate over the use of this drug in
Because of their unique physiology, all horses running at racing speeds experience varying degrees of
exercise-induced pulmonary hemorrhage, or bleeding into their airways. Because of blood pressure
changes in the lung that are unique to horses during exercise, more than half of Thoroughbred
racehorses have some amount of blood in their trachea after a single race.
While horses rarely bleed severely into their airways, the same research group working on this project
in South Africa previously confirmed the widely held belief that bleeding into the airways impairs
athletic performance of horses. Morley and co-researchers Kenneth Hinchcliff from the University of
Melbourne and Alan Guthrie from the University of Pretoria will conduct research in South Africa
because use of furosemide is not currently allowed on race days in horses, and also because of the
interest and support from the South African racing industry.
Use of furosemide, which is sold as Lasix and Salix, to treat pulmonary hemorrhaging in racehorses
began in the 1970s. Today it is estimated to cost $30 million annually to treat horses with furosemide
on race days in the United States and Canada.
Furosemide is also used in other species, including humans, to control blood pressure and fluid
"While its use in the racing industry has always been controversial, controversy surrounding use of
this drug increased with the discovery that horses receiving furosemide prior to racing generally
perform better," Morley said. "A study of more than 22,000 racehorses that was previously conducted
by our research group found that horses treated with furosemide raced faster, earned more money and
were more likely to finish in a top position. It is possible that performance is improved by preventing
or minimizing lung bleeding in these horses, but it is also possible that improved performance is
caused by other drug effects, such as transient weight loss. Race horses treated with furosemide lose
about 2 percent of their body weight - or about 20 pounds - prior to racing, which may make it
In South Africa, horses participating in the research project will compete in two races, once treated
with furosemide and once with a placebo. Each horse will be examined after each race for evidence
of bleeding and for the effects of furosemide on pulmonary hemorrhaging. In addition, their
performances will be evaluated to identify differences in performance.
Other than the use of furosemide, which will be administered strictly adhering to research project
guidelines, all races will take place under South Africa's standard rules and regulations for the
industry. The horses and jockeys will race for purses to ensure competitive racing efforts. The five to
eight furlong races will be conducted on a one-mile straightaway on the turf at the Vaal Racecourse
in South Africa. The races will take place Nov. 20-21 and Nov. 27-28.
If the study points to the effectiveness of furosemide in treating hemorrhaging, the results will help
veterinarians and horsemen make more prudent and informed decisions about the drug's use and
alleviate concerns that the drug is primarily being used to enhance racing performance.
"Regardless of whether or not furesomide can be shown to prevent pulmonary hemorrhaging, results
of this study will provide critical information for policy-makers in the horse racing industry
Several sectors of the racing jurisdiction have pledged support. The Grayson-Jockey Club foundation
and the Racing Medication and Testing Consortium, both from the United States, have provided
about $150,000 to support this research, and an equivalent amount of support is being provided by the
South African horse racing and from high profile private sponsors, including golfing legend Gary
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