Abstract
Although cryopreserved boar semen has been available since 1975, a major breakthrough in commercial application has not yet occurred due to the high susceptibility of boar spermatozoa to damage during cryopreservation and the complicated process required for deep freezing. In recent years, the application of antioxidants during the cryopreservation of boar semen has been the subject of considerable research aimed at improving the quality of post-thaw semen. Centrifugation is necessary before using cryopreservation protocols for freezing boar spermatozoa. Studies of the effect of different centrifugation regimens on boar sperm recovery, yield and cryosurvival have made significant contributions. Therefore this review elucidates results of recent applications of various antioxidants and centrifugation regimens used in efforts to improve cryopreservation of boar spermatozoa. This review is intended to enhance understanding of the roles of these antioxidants and centrifugation regimens with respect to mechanisms that increase resistance to cryodamage of boar spermatozoa. In addition, the discussion addresses the need for developing an objective evaluation of effectiveness and estimating the prospect of application of new techniques for the cryopreservation of boar semen and its use in artificial insemination.
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