Some 10,000 horses move freely between the UK and Ireland, but that could all change if a "hard Brexit" is implemented.
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The racing industries of both countries rely heavily on the free movement of horses: Britain for a supply of racehorses, and Ireland for the sale of them.
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The British Horseracing Authority (BHA) hopes to "maintain the free movement of thoroughbreds within Europe."
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Irish horse breeders have already cut their stud fees following the sterling's decline against major currencies.
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But the BHA also says that, while challenges remain, there are "opportunities presented by Brexit."