Journal of Embryo Transfer (한국수정란이식학회지)

The Korean Society of Embryo Transfer (한국수정란이식학회)
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Effect of Meiotic Maturation of Canine Oocytes Cultured in Reproductive Tract

개 미성숙난자의 체내이식 배양이 핵성숙에 미치는 영향

  • Lee H. S. (Department of Animal Science and Technology, College of Agriculture and Life Sciences, Sunchon National University) ;
  • Lee Y. H. (Department of Animal Science and Technology, College of Agriculture and Life Sciences, Sunchon National University) ;
  • Yin X. J. (Department of Animal Science and Technology, College of Agriculture and Life Sciences, Sunchon National University) ;
  • Kong I. K. (Department of Animal Science and Technology, College of Agriculture and Life Sciences, Sunchon National University)
  • 이효상 (순천대학교 농업생명과학대학 동물자원과학과) ;
  • 이영호 (순천대학교 농업생명과학대학 동물자원과학과) ;
  • 윤희준 (순천대학교 농업생명과학대학 동물자원과학과) ;
  • 공일근 (순천대학교 농업생명과학대학 동물자원과학과)
  • Published : 2005.04.01
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Abstract

This study were carried out to evaluate the possibility of nuclear progression of canine immature oocytes, of which was cultured in a reproductive tract, such as oviduct, ovarian bursa and uterus of estrus bitch for 4, 5 and 6 days following immediately collection. Cumulus intact oocytes(COC) fore collected from domestic dog following ovariohysterectomy at local veterinary clinics. In Exp. 1, COCs $of>110\;{\mu}m$ diameter were selected and cultured in vitro at $39^{\circ}C$, $5\%\;CO\_{2} $ in air atmosphere. The nuclear progression of canine oocytes checked at 24, 48 or 72 h after in vitro maturation. There was not increased the nuclear progression to the M II stage depending on culture periods at 24, 48 and 72h $(1.3\%,\;3.7\%\;and\;4.7\%)$. In Exp. 2, to evaluate of nuclear progression of immature oocytes, collected or in vitro cultured oocytes were transfer into a canine reproductive tract (oviduct, ovarian bursa and uterus). The recovery rates of canine oocytes from a reproductive tract after 4 days $(33.7\%)$ in vivo culture were significantly higher than those 5 $(17.7\%)$ 6 day $(3.4\%)$ (P<0.05). The survival rates of collected oocytes after 4 days $(60.0\%)$ were also significantly higher than those of 5 days $(30.2\%)$ and 6 days $(38.9\%)$ (P<0.05). The meiotic resumption rates of canine oocytes were not significantly difference among the culture periods at 4 days $(5.9\%)$, 5 days $(0.0\%)$ and 6 days $(0.0\%)$. These results show that the nuclear progression of canine immature oocytes from in in vivo culture was not affect the nuclear resumption of oocytes.

본 연구는 개의 미성숙난자의 낮은 성숙율을 개선하기 위하여 자연발정온 개의 생식기관에 미성숙 난자를 이식하여 체내 배양 난자를 회수하여 회수된 난자의 핵 성숙율을 조사한 결과는 다음과 같다. 1. 미성숙난자를 24, 48 및 72시간 동안 체외성숙을 유도하였을 때 성숙시간에 따른 체외성숙율에는 유의적 차이는 인정되지 않았다. 2. 체내 배양 기간에 따른 난자의 회수율은 배양기간이 길어질수록 유의적으로 낮은 회수율을 보였으며, 배양기간이 증가할수록 난자의 생존율은 유의적으로 (P<0.05) 저하되었고 사멸된 난자의 비율도 또한 증가하였다. 3. 회수된 난자는 4, 5, 6일간의 체내 배양기간에 관계없이 대부분 GV상태로 (20/34; 6/15; 4/7)존재하였으며, 성숙된 난자는 체내 배양 4일째 회수된 난자에서 $5.8\%(2/34)$의 난자가 M II까지 발달한 것으로 조사되어 개의 미성숙난자의 체내 배양은 개 난자의 핵성숙을 개선하지 못하였다. 이상의 결과에서와 같이 개의 미성숙난자의 체내 배양은 M II 단계까지의 발달에 기여하지 못한 것으로 판단되며, 이는 개 미성숙난자의 핵발달은 난포에서의 자극과 활성화가 요구되는 것으로 판단된다.

Keywords

References

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