The shipment of PMU (pregnant mare urine) mares from farms in the United States and Canada has been put on hold until after the foaling season, unless the shipping distance is very short.

The reason, says Nat Messer IV, DVM, University of Missouri, and a member of an advisory board created by Wyeth Industries in Brandon, Manitoba, is because the mares are in late-term pregnancy and there is concern that long-distance travel will put both mare and foal at risk

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