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In vitro embryo production in wood bison (Bison bison athabascae) using in vivo matured cumulus-oocyte complexes

Cervantes, M.P., Palomino, J.M., Anzar, M., Mapletoft, R.J., Mastromonaco, G.F., Adams, G.P. (2017). In vitro embryo production in wood bison (Bison bison athabascae) using in vivo matured cumulus-oocyte complexes, 89 122-130. http://dx.doi.org/10.1016/j.theriogenology.2016.10.017

Abstract

© 2016 Experiments were conducted in wood bison to determine the effect of additional maturation time on embryo development of in vivo matured oocytes. In experiment 1, cumulus-oocyte complexes (COC) were collected 30 hours after hCG treatment in superstimulated wood bison, and expanded COC were fertilized immediately or after 4 hours of additional in vitro maturation. Embryo development was assessed on Days 3, 7, and 8 (Day 0 = day of fertilization). No difference in cleavage rate was detected (55.3% vs. 60.5%, P = 0.82), but the Day 8 blastocyst rate was higher after an additional 4 hours of in vitro maturation time (44.7 vs. 18.4%, P = 0.03). In experiment 2, COC were collected at either 30 hours or 34 hours after hCG treatment. Expanded COC from the 30 hours group were fertilized after 4 hours of in vitro maturation, whereas those from the 34 hours group were fertilized immediately. A higher cleavage rate (74.3 vs. 57.0%) and blastocyst rate (54.1 vs. 37.2%) were found in the 34 hours group versus the 30 hours group (P < 0.05). In conclusion, an additional short period of in vitro maturation, or an extended period of in vivo maturation are beneficial for in vitro embryo production in wood bison.

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