Journal of Embryo Transfer (한국수정란이식학회지)

The Korean Society of Embryo Transfer (한국수정란이식학회)
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Comparison of Oocyte Recovery Rates between Prepubertal and Adult Korean Native Goats

미성숙 및 성숙 재래 산양의 과배란 처리에 의한 난자의 회수율 비교

  • Yun, Yun-Jin (Department of Animal Science and Biotechnology, Gyeongnam National University of Science and Technology) ;
  • Park, Hee-Sung (Department of Animal Science and Biotechnology, Gyeongnam National University of Science and Technology)
  • 윤윤진 (경남과학기술대학교 동물생명과학과) ;
  • 박희성 (경남과학기술대학교 동물생명과학과)
  • Received : 2011.08.02
  • Accepted : 2011.08.20
  • Published : 2011.09.30
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Abstract

This study was conducted to examine whether efficiency of oocyte production from superovulated prepubertal goats. Fifteen prepubertal and twenty adult goats, maintained in a pen under natural day length and fed hay ad libitum, were pretreated with progestagen implanted CIDR for 10 days. Superovulation treatment of the goats received twice daily intramuscular injection of a total of 70 mg FSH for 3 days from Day 8 of CIDR. All the gonadotrophin treated goats were injected with 10 mg $PGF_2{\alpha}$ on Day 8 and 400~600 IU hCG in the afternoon on Day 10. Oocytes were recovered by follicle aspiration or oviduct flushing at 35 to 40 h after hCG injection through mid-ventral incision. The in vivo matured oocytes was activated by ionomycin (5 min) and 6-DMAP (3.5~4 h). The activated oocytes were cultured in mSOF medium containing 0.8% BSA at 38.5$^{\circ}C$ in an atmosphere of 5% CO$_2$, 5% O$_2$, 90% N$_2$ for 7~8 days. There was no significant difference in the mean number of CL and in vivo matured and follicular oocytes recovered. But, quality of I + II grade follicular oocytes was lower (p<0.05) in the prepubertal goat (25.0%) than the adults (52.4%). The same results were also observed in the cleavage and blastocyst rate of activated oocytcs. The cleavage and blastocyst rate from prepubertal derived oocytes were lower (p<0.05) in the prepubertal goat (54.5%, 23.3%) than the adult goat (86.8%, 46.6%). Considering overall these results, we suggest that maturation of donor goats is a major factor affecting recovered oocytes quality and in vitro development of activated goat oocytes.

본 연구는 효율적인 재래 산양의 난포란을 확보하기 위하여 미성숙 산양에 과배란 처리를 실시하여 체내 성숙 난자(배란된 난자) 및 난포란을 회수하여 공란산양의 성숙 여부가 난자의 회수율과 단위 발생란의 체외발달율에 미치는 영향을 조사하였다. 미성숙 산양의 과배란 처리에 의한 체내 성숙 난자의 회수율에 있어서 과배란 처리 후 두당 황체수는 13.1${\pm}$6.5개로서 성숙 산양의 8.8${\pm}$2.4개와 차이가 없었다(p<0.05). 산양의 두당 회수율은 마성숙 산양이 9.l${\pm}$6.8개로서 성숙 산양의 9.8${\pm}$2.5개와 차이가 없었다. 공란산양으로부터 체내 성숙 난자 회수 후 난소의 난포로부터 채란한 난포란의 회수율에 있어서 산양 두당 난포 수는 미성숙 산양이 7.9${\pm}$6.5개로서 성숙 산양의 8.8${\pm}$2.4개와 차이가 없었다. 이들 황체로부터 회수한 난포란 수도 미성숙 산양이 5.6${\pm}$6.1개로서 성숙 산양의 6.3${\pm}$2.3개와 차이가 없었다. 회수한 난포란의 등급에 있어서 1+II 등급 난포란은 미성숙 산양이 25.0%로서 성숙 산양의 52.4%보다는 낮았다(p<0.05). 4등급의 비율은 미성숙 산양이 39.3%로서 성숙 산양의 19.8%보다는 높았다(p<0.05). 미성숙 산양으로부터 회수한 체내 성숙 난자를 단위 발생을 유도하였을 때 분할율은 54.5%로서 성숙 산양으로부터 회수한 단위 발생 난자의 분할율 86.8%보다는 낮았다(p<0.05). 배반포기로의 발달율에 있어서도 미성숙 산양이 23.3%로서 성숙 산양의 46.6%보다는 유의적 (p<0.05)으로 낮았다. 이상의 결과를 미루어 볼 때 미성숙 재래 산양으로부터 난자의 생산은 난자의 확보 측면에서는 한 방법이 될 수 있으나, 회수란의 질 저하에 대한 문제는 공란 산양의 보다 적합한 연령, 실험 시기, 성선자극 호르몬의 양 및 공시 산양의 관리 등 앞으로 보다 세밀한 검토가 필요한 것으로 생각된다.

Keywords

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