However, there is controversy surrounding how to consistently judge airway function."What is a 2a versus a 2b?" asked program co-chair Dr. Scott Pierce by way of explaining what the video would show.The AAEP wants to get feedback from its members on this information, and then make a DVD copy available to veterinarians to help them use the same terminology when discussing horses.Pierce did a study three years ago with 800 horses that showed no statistical difference in racing ability between horses graded 1, 2a, and 2b. He since has added 500 horses to the study, but still sees no statistical difference. He and his colleagues are now doing 2,000 yearling airways to see how those relate to performance.A question from the audience asked: "How many horses will it take in a study before people start accepting not-perfect airways?" In other words, a horse that has a 2b throat is statistically as likely to make it as a racehorse as a horse that has no throat problems, but many buyers aren't as willing to purchase that horse.Dr. Steve Conboy called this is a serious issue for the industry because of attrition to consignors. "How many horses go down the tubes (are rejected at sales) because the horse 'fails' the endoscopic exam? We are losing too many horses."Along these same lines, veterinarians are worried sale weanlings are being held to the same "wind" standards as yearlings, even though conditions of sales for weanlings don't generally cover wind conditions.
Dr. Roger Murphy, the other chair of the forum, said he has scoped many weanlings and is surprised at the number that have poor airways that get better with maturation. "Those that are paralyzed stay paralyzed," he noted. There was a question of whether consignors are selling weanlings in November sales that might have "weaker" immature throats instead of holding them until the yearling sales, when they would be held to stricter conditions of sale.