Sperm cryopreservation is a method of preserving semen indefinitely.Unlike refrigerated semen, which is kept for no longer than 7 days, frozen semen can be kept submerged in liquid nitrogen for an unlimited amount time.Sperm cryopreservation is especially indicated for the import and export of semen doses.For sanitary reasons, the number of states that limit the entry of reproductive animals coming from other countries is increasing and, consequently, the import or export of frozen semen becomes the most sanitary alternative to be able to introduce genetic lines of a high economic value.Sperm cryopreservation also allows sperm banks to be created, which can also be used as germplasm banks, that is, as a store of genetic lines of high genetic and economic value, or as storage for sperm doses to be able to supply the usage needs in periods with lower sperm production or quality.For artificial insemination centres, sperm cryopreservation allows more profit to be made on sperm from reproductive males, thus improving sperm management and insemination planning.The defrosted semen doses are usually used for post-cervical insemination, a simple technique that offers excellent fertility and prolificity results.