Produção de embriões partenogenéticos de cutias usando Cloreto de Estrôncio e Citocalasina B / Production of parthenogenetic embryos from agoutis using strontium chloride and cytochalasin B

ABSTRACT

The study aimed to evaluate the effect of strontium chloride (SrCl2) with cytochalasin B (CB) on the activation of agouti oocytes matured in vitro for embryo production. Thus, ovaries were used for oocyte recovery by slicing. Subsequently, viable oocytes were destined for in vitro maturation (IVM) and after 24 h evaluated for the expansion and viability of the cumulus cells and presence of the first polar body (1PB). After IVM, oocytes were activated with a combination of 10 mM SrCl2 and 5 μg/mL CB for 6 h and evaluated for embryo development kinetics. Hence, 93.3% of cumulus cell expansion was observed, with 91.2% viability and 37.3% of oocytes with the presence of 1PB. Regarding embryonic development, 43.2% (19/44) of cleaved structures and 6.8% (3/44) of morulae were observed in relation to the number of oocytes and 18.8% (3/16) morulae in relation to the number of cleaved structures. Thus, the combination of SrCl2 with CB promoted the activation of oocytes matured in vitro from agouti resulting in morulae. Finally, with this study, fundamental steps for in vitro conservation through reproductive biotechniques were developed in agoutis.