Avaliação da dimetilacetamida e do glicerol na criopreservação do sêmen de suínos através de testes de fertilização in vitro

Abstract

The evaluation of the efficiency of semen cryopreservation is critical to make the use of frozen semen feasible in artificial insemination programs in swine. This study compared the efficiency of two non-penetrating cryoprotectants (dimetilacetamide-DMA or glycerol) on parameters of post-thawing semen quality and in vitro fertility with frozen swine semen. The sperm-rich fractions of 28 ejaculates from four boars were frozen with either DMA or glycerol. The efficiency of semen freezing was evaluated through parameters of post-thawing semen quality and in vitro penetration (IVP) of swine oocytes and embryo production. For samples frozen with DMA, sperm motility (38.1%) and membrane integrity (39.9%) were greater (P < 0.05) than those for glycerol (21.9% and 13.0%, respectively). Both the IVP rate and the number of spermatozoa per oocyte were greater (P < 0.05) for DMA (27.9% and 29.2, respectively) than for glycerol (13.6% and 20.7, respectively). The cleavage rate with DMA and glycerol samples (13.0% and 15.6%, respectively) were similar (P > 0.05). The embryo development rate did not differ (P < 0.05) for DMA (15.8%) and glycerol (22.0%). Therefore, when compared to glycerol, DMA was associated with improved post-thawing semen quality and in vitro fertility.