Limerick has been transferred to Fermanagh in the cause of science and cross-Border co-operation, according to Teagasc, the agriculture and food development authority.
Limerick is one of Ireland's best-known breeding mares and has produced high-quality sport horses.
Kildalton Agricultural College and the Army Equitation School had been using Limerick to breed potential competition horses for the Army.
But now that programme has been given a boost because of a unique horse-breeding project launched in 1996 at Irvinestown, Co Fermanagh, with the support of the EU.
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The Equiova project is designed to assist rural horse-breeders in Northern Ireland and the Border counties in the Republic to raise the genetic merit of foals.