Merino sheep are also noted for their hardiness and their herding instincts and have been used as parents of several other breeds, notably the Rambouillet of France.
Meriinolammastest on ka tuntud oma vastupidavusega ja nende karjatusvaistu ja on kasutatud vanemad mitmete teiste tõugude, eriti Rambouillet Prantsusmaal.