Reproductive and Developmental Biology

The Korean Society of Animal Reproduction (한국동물번식학회)
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Study on Development of Canine Oocytes Treated by In Vitro Fertilization and ICSI

  • Park, Ji-Hoon (College of Veterinary Medicine, Chungnam National University) ;
  • Chung, Young-Ho (Dept. of Companion Animal and Animal Resourses Science, Joongbu University) ;
  • Kim, Sang-Keun (College of Veterinary Medicine, Chungnam National University)
  • Received : 2011.05.07
  • Accepted : 2011.05.30
  • Published : 2011.06.30
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Abstract

These study was to investigate the in vitro fertilization and viability of fresh and vitrified oocytes. Also, the developmental capacity of IVF and intracytoplasmic sperm injection (ICSI) oocytes were investigated. Then vitrification was performed with the use of 20% ethylene glycol + 20% DMSO + 0.5 M sucrose + 10% FCS + TCM-199 medium. Vitrification immature oocytes are cultured in vitrification solution for 10 min afterwards transferred to expose at room temperature for 5 min. and transferred to the ice water for 5 min. The oocytes were sealed in a 1.0 mm straw and placed in a $LN_2$ container. Frozen oocytes were rapidly thawed in a water bath at $30{\sim}35^{\circ}C$, and then placed in TCM-199 medium containing 0.5 M sucrose for 5 min each, respectively, at $38^{\circ}C$. After being washed for 2~3 times, using fresh medium the oocytes were cultured in TCM-l99 medium supplemented with 5% FCS at $38^{\circ}C$ in 5% $CO_2$ and air. The normal morphology of fresh and vitrified-thawed oocytes were $87.1{\pm}2.1%$ and $54.8{\pm}2.5%$, respectively. The viability rates of fresh and vitrified-thawed oocytes were $70.0{\pm}2.2%$ and $41.9{\pm}2.6%$, respectively. Viability rates of vitrified-thawed oocytes were lower than that of fresh follicular oocytes (p<0.05). The in vitro maturation rates of fresh and vitrified oocytes were $45.1{\pm}3.6%$ and $28.9{\pm}4.4%$, respectively. The IVF rates of fresh follicular and vitrified-thawed oocytes were 34.00.2% and $20.2{\pm}2.6%$, respectively. The in vitro maturation and fertilization rates of vitrified-thawed oocytes were lower than those of the fresh follicular oocytes (p<0.05). A total of 350 oocytes were fixed and stained after co-incubation with spermatozoa, of which 88 had identifiable nuclear material. After IVF for 20 hrs, $25.1{\pm}3.4%$ of the oocytes found to have been penetrated by spermatozoas. Oocytes were fixed and stained after ICSI, and 105 oocytes contained identifiable nuclear material. After IVF and ICSI for 20 hrs, $34.3{\pm}3.4%$ and $59.0{\pm}2.0%$ of the oocytes were found to have been penetrated by spermatozoas. The developmental rates upon ICSI were significantly higher than those of the IVF method (p<0.05).

Keywords

References

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