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In page Horse welfare:

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Harness racing According to the Australian scientist Paul McGreevy, the use of the riding crop in horse racing is "the most public and the most televised form of violence in the modern world". It raises a greater ethical problem because of the pain inflicted on an animal generally exhausted from effort. His study demonstrates that the (frequent) use of the crop does not translate into better racing performance, as race horse breeds are already genetically selected to run as fast as possible.[1] In addition, blows delivered in the last 200 metres of the race often hit the horse in the sensitive part of the abdomen, leaving a very visible mark. The "anti-pain crop" invented in England is actually as painful as others.