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Effects of PZM Media on In Vitro Development of Porcine IVM/IVF Embryos  

한만희 (축산연구소)
천행수 (충남대학교 동물자원학)
김종화 (충남대학교 동물자원학)
박병권 (공주대학교 영상보건대학 특수동물학)
서길웅 (충남대학교 동물자원학)
이규승 (충남대학교 동물자원학부)
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Abstract
The present study was carried out to examine the effects of $O_2$ concentrations and culture media (North Carolina State University (NCSU)-23, porcine zygote medium(PZM)-3 or PZM-4) on in vitro development of porcine IVM/IVF embryos. Porcine oocyte-cumulus complexes were cultured in BSA-free NCSU-23 medium containing porcine follicular fluid (10%), cysteine (0.9 mM), $\beta$-mercaptoethanol (25 $\mu\textrm{g}$/$m\ell$), epidermal growth factor (10 ng/$m\ell$) and hormonal supplements (PMSG and hCG: 10 IU/$m\ell$) for 20∼22 h. They were then cultured in the same medium but without hormonal supplements for an additional 20∼22 h. After culture, cumulus-free oocyte were coincubated with liquid boar spermatozoa for 5∼6h. Putative zygotes were transferred to NCSU-23, PZM-3 and PZM-4 medium under the condition of 5% $O_2$ or 20% $O_2$ concentrations. At 48 h, no mean differences were found in cleavage rates. However, the rates of blastocyst formation at day 7 after in vitro fertilization were significantly higher in PZM-3 medium under the condition of 5% $O_2$ concentration than other treatments (19.9$\pm$2.4 vs. 11.1$\pm$2.0 to 16.0$\pm$2.5%, P<0.05). The total cell numbers of blastocysts were significantly higher in 5% $O_2$ than in 20% O2 (P<0.05). However, no differences was found among the culture media within each $O_2$ concentrations. In conclusion, the use of PZM-3 medium in 5% $O_2$ concentration was effective on in vitro development of porcine IVM/IVF embryos.
Keywords
Porcine IVM/IVF embryo; PZM-3; O$_2$ concentration;
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