The Relative Centrifugation Force Permits Visualization of the Germinal Vesicle in Pig Oocytes

  • Hsieh, Chang-Hsing (Taichung Military General Hospital and National Chung Hsing University) ;
  • Lee, Stone (Department of Animal Science, National Chung Hsing University) ;
  • Jaw, Si-Ning (Department of Animal Science, National Chung Hsing University) ;
  • Tseng, Jung-Kai (Department of Animal Science, National Chung Hsing University) ;
  • Tang, Pin-Chi (Department of Animal Science, National Chung Hsing University) ;
  • Chang, Lan-Hwa (Taichung Military General Hospital and National Chung Hsing University) ;
  • Ju, Jyh-Cherng (Department of Animal Science, National Chung Hsing University)
  • Received : 2003.12.19
  • Accepted : 2004.05.08
  • Published : 2004.09.01


Pig oocytes contain high levels of lipids in the ooplasm, which reduces the visibility of the germinal vesicle (GV) under microscopic examination. Therefore, the purposes of this study were to investigate the effects of relative centrifugation force (RCF) on the visibility and maturation rates of the GV stage oocytes after centrifugation. In Experiment 1, cumulus-oocyte-complexes (COCs) were collected from slaughterhouse ovaries and randomly allocated to different RCFs (3,000 rpm: 970 g; 6,000 rpm: 3,900 g; or 10,000 rpm: 10,840 g) for 10 or 20 min. Percentages of visible GV were 76-79% in the oocytes centrifuged with 10,000 rpm, which were significantly higher (p<0.01) than those with 3,000 and 6,000 rpm. No significant differences in GV visibility were observed among oocytes with different lengths of centrifugation (p<0.05) regardless of the RCFs. In esperiment 2, the maturation rate of the oocyte was found significantly lower in the 20 min than in the 10 min group received 10,840 g of RCF (30 vs. 75%, p<0.05). In conclusion, the GV of porcine oocytes can be clearly visible by centrifugation at 10,840 g for 10 min without compromising their subsequent maturation rates and a longer centrifugation time (20 min) had no beneficial influence on the visibility of GV stage pig oocytes.


Oocyte;Germinal Vesicle;Pig;Relative Centrifugation Force (RCF)


Supported by : National Science Council


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