Inseminação artificial intra-uterina em leitoas com sêmen criopreservado com dimetilacetamida e glicerol

Abstract

The objective of this study was to evaluate the use of dimethylacetamide (DMA) and glycerol in boar semen cryopreservation on the conception and fertility rates. Sixty pre-pubertal gilts were synchronized and inseminated with semen including either glycerol 3% or DMA 5% as cryoprotectants (n=30 for both groups). Artificial insemination was conducted with the intrauterine method using doses with 1 × 109 viable spermatozoa. The gilts were slaughtered 36-40h after the insemination and the hemorrhagic bodies (CH) in the ovaries were counted. The oviducts were washed, so oocytes and embryos could be recovered to determine the conception and fertility rates. The average CH obtained with glycerol 3% did not differ (P>0.05) from those observed with DMA (10.4 x 10.2, respectively). Recovery rates also did not differ (P>0.05) between groups (68.9% with glycerol and 66.9% with DMA). Conception (73.3 x 76.6%) and fertility rate (48.6 x 59.4%) were also similar (P>0.05) for glycerol and DMA, respectively. Those results indicate that DMA 5% can replace glycerol 3% in the composition of extenders for frozen boar semen.