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Volume 60, issue 4 | Copyright
Arch. Anim. Breed., 60, 385-390, 2017
https://doi.org/10.5194/aab-60-385-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Original study 17 Oct 2017

Original study | 17 Oct 2017

Three-step in vitro maturation culture of bovine oocytes imitating temporal changes of estradiol-17β and progesterone concentrations in preovulatory follicular fluid

Minami Matsuo, Kazuma Sumitomo, Chihiro Ogino, Yosuke Gunji, Ryo Nishimura, and Mitsugu Hishinuma Minami Matsuo et al.
  • Laboratory of Theriogenology, Joint Department of Veterinary Medicine, Faculty of Agriculture, Tottori University, 4-101 Koyama-minami, Tottori 680-8553, Japan

Abstract. The objective of the article is to evaluate the effect of three-step in vitro maturation (IVM) culture system imitating estradiol-17β (E2) and progesterone (P4) concentrations in preovulatory follicles on in vitro bovine embryo production. The cumulus–oocyte complexes (COCs) were collected from follicles (2 to 8mm in diameter) of bovine ovaries obtained from a local slaughterhouse. For IVM, the COCs were cultured for 22h in a three-step system: (1) culture in medium 199, containing 700ngmL−1 E2 and 50ngmL−1 P4, for 5h, followed by the medium containing 150ngmL−1 E2 and 150ngmL−1 P4 for 11h, and then the medium containing 20ngmL−1 E2 and 300ngmL−1 P4 for 6h (EP group); (2) culture in the medium containing 700ngmL−1 E2 for 5h, followed by the medium containing 150ngmL−1 E2 for 11h, and then the medium containing 20ngmL−1 E2 for 6h (E group); or (3) culture in the medium containing 50ngmL−1 P4 for 5h, followed by the medium containing 150ngmL−1 P4 for 11h, and then the medium containing 300ngmL−1 P4 for 6h (P group). The COCs were cultured in the medium containing 1000ngmL−1 E2 for 22h (control group). After IVM, the COCs were co-incubated with sperm and further cultured. At 48h after insemination, the cleavage rate of embryos was not different among the groups. At 192h after insemination, the blastocyst formation rate of EP group was significantly higher than that of the other groups. The total cell number of blastocysts did not differ among the groups. In conclusion, these results demonstrate that the three-step IVM culture system of bovine oocytes imitating temporal changes of E2 and P4 concentrations in preovulatory follicular fluid improves the developmental potential of embryos in vitro.

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Bovine cumulus–oocyte complexes were cultured in a three-step system imitating estradiol-17β (E2) and progesterone (P4) concentrations in preovulatory follicular fluid for in vitro maturation (IVM). The blastocyst formation rate after E2- and P4-imitated IVM was significantly higher than that after the other IVM (control, E2-imitated, P4-imitated), suggesting that the three-step IVM system with the preovulatory levels of E2 and P4 improves the developmental potential of embryos in vitro.
Bovine cumulus–oocyte complexes were cultured in a three-step system imitating estradiol-17β...
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