Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Bovine Oocytes Can Be Penetrated in Modified Tris-buffered Medium

  • Park, Kwang-Wook (The Graduate School of Natural Science and Technology, Faculty of Agriculture, Okayama University) ;
  • Niwa, Koji (The Graduate School of Natural Science and Technology, Faculty of Agriculture, Okayama University)
  • Received : 2008.08.04
  • Accepted : 2008.10.14
  • Published : 2009.04.01
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Abstract

A modified Tris-buffered medium (mTBM) has been widely used as an insemination medium for porcine in vitro fertilization (IVF). We examined whether mTBM could be used for bovine IVF. Bovine cumulus-oocyte complexes (COCs) were cultured in a serum-free medium containing 30 ng/ml EGF for 22 h. After culture, COCs were inseminated with spermatozoa for 12 h in mTBM containing 5 mM caffeine and 10 g/ml heparin. The penetration of oocytes increased significantly (p<0.05) as the sperm concentration increased from 0.1 (30%) to 1-10 $(87-100%){\times}10^6$ cells/ml. This was significantly different from values obtained at 1 (87%) and 10 $(100%){\times}10^6$ cells/ml. However, when COCs were inseminated with spermatozoa from different bulls, the proportions (62-100%) of oocytes penetrated varied according to the bull. The proportion (18%) of oocytes penetrated was significantly (p<0.05) lower in a fertilization medium without caffeine and heparin but increased with the addition of caffeine and/or heparin to the medium, and the proportion (93-96%) of oocytes penetrated increased significantly (p<0.05) when the medium was supplemented with heparin and caffeine. In this medium, sperm penetration was first observed at 3 h after insemination. Irrespective of the presence of glucose in the fertilization medium, the proportion (93-97%) of oocytes penetrated and the proportion (83-84%) of embryos at the ${\geq}2$-cell stage cultured in a chemically defined medium were not significantly different. However, the proportion of embryos developing to the blastocyst stage was significantly (p<0.05) higher in the presence (11%) of glucose in the fertilization medium than in its absence (2%). In conclusion, the present study demonstrated that bovine oocytes penetrated in vitro in mTBM can develop to the blastocyst stage and mTBM may be used for the in vitro production of bovine embryos.

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References

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