The movement of racehorses around New Zealand will be monitored more closely in the future in case of any biosecurity issues.
New Zealand Thoroughbred Racing said many horses were now campaigned for long periods away from their registered stables.
The 2007 outbreak of equine influenza in Australia highlighted that tracking horses away from their stables was a key component of improving biosecurity, NZTR said.
"The horse population is one of the most mobile of all animal populations and strict movement controls, including a total standstill for 4-6 weeks at the start of an outbreak and mapping of horse populations, are essential components of the response to an EI outbreak," it said.
From June 1, trainers will be required to complete a horse movement application form in the event of any horse being away from its registered stable for seven or more days.
NZTR will enter the information into a database that will be available to stipendiary stewards.