Piezo-assisted Intracytoplasmic Sperm Injection in Cattle

  • Kim, Se-Woong (Cellular Reprogramming and Embryo Biotechnology Lab, Dental Research Institute and CLS21, Seoul National University School of Dentistry) ;
  • Kang, Ho-In (Cellular Reprogramming and Embryo Biotechnology Lab, Dental Research Institute and CLS21, Seoul National University School of Dentistry) ;
  • Sung, Ji-Hye (Cellular Reprogramming and Embryo Biotechnology Lab, Dental Research Institute and CLS21, Seoul National University School of Dentistry) ;
  • Roh, Sang-Ho (Cellular Reprogramming and Embryo Biotechnology Lab, Dental Research Institute and CLS21, Seoul National University School of Dentistry)
  • Received : 2010.04.22
  • Accepted : 2010.05.04
  • Published : 2010.06.30

Abstract

Intracytoplasmic sperm injection (ICSI) is one of the artificial fertilization methods when only a few sperm are available for insemination, and an important tool for the preservation of genetic materials of endangered animal species, especially the male is infertile. Different from other species such as mice and pigs, the conventional ICSI method which uses spiked pipette for injection (Spike-ICSI) is exhibited low success rates in cattle because the bovinesperm head membrane is hard to break during injection procedure. We chose piezo-assisted ICSI (Piezo-ICSI) for the improvement of the injection procedure including sperm head membrane rupture and efficient puncture of the plasma membrane of the oocytes. In this experiment, we compared the efficacy of the bovine ICSI embryo production between the Piezo-ICSI and Spike-ICSI. The second polar body extrusion, pronuclear formation, cleavage and blastocyst formation were evaluated after implementation of two different ICSI techniques. The Piezo-ICSI tended to show comparably higher rates of the second polar body extrusion (41.7%), the pronuclei formation (42.9%) and the two-cell cleavage (41.4%) than Spike-ICSI does (33.3%, 28.6% and 23.5%, respectively) although there is no statistic significance between two groups. In addition, the blastocysts were only obtained from the Piezo-ICSI group (10.3%). Our finding shows that the Piezo-ICSI may be used as an artificial fertilization method in cattle when in vitro fertilization is not applicable.

Keywords

References

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