• 대한생식의학회:학술대회논문집
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• 1995.12a
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• pp.64.1-64.1
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• 1995

• 대한생식의학회:학술대회논문집
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• 1995.12a
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• pp.65-65
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• 1995

• Korean Journal of Animal Reproduction
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• v.22 no.3
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• pp.207-211
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• 1998

본 연구는 소 미성숙 난자의 동결에 있어서 미성숙 난자의 1, 2, 4, 8 시간 성숙배양한 다음 동결 융해 후 체외배양하였을 때 체외수정율과 생존율을 조사하고저 수행하였다. 미성숙 난자들 1∼8시간 성숙배양후 동결융해 및 체외수정시켰을 때 수정율은 12.8∼30.9%로서 단시간의 체외성숙 배양이 높게 나타났으며(23.8∼28.8%), 또한 체외배양시 생존율은 11.8∼29.9%를 나타냈다.

• 대한생식의학회:학술대회논문집
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• 1994.10a
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• pp.28-29
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• 1994

• 대한생식의학회:학술대회논문집
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• 2001.11a
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• pp.100-100
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• 2001

• 대한생식의학회:학술대회논문집
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• 1999.11a
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• pp.77-77
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• 1999

• 대한생식의학회:학술대회논문집
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• 1999.11a
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• pp.78.1-78.1
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• 1999

• Asian-Australasian Journal of Animal Sciences
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• v.20 no.4
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• pp.487-495
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• 2007

The objectives of the present study were to initiate cloning of Korean native goat by somatic cell nuclear transfer (NT) and to examine whether unovulated (follicular) oocytes can support the same developmental ability of NT embryos as ovulated (oviductal) oocytes after hCG injection in stimulated cycles of the goat. The in vivo-matured and immature oocytes were collected from the oviducts and follicles of superovulated does, respectively, and the immature oocytes were maturated in vitro. Ear skin fibroblasts derived from a 3-yr-old female Korean native goat were used as the donors of nuclei or karyoplasts. Following fusion, activation and in vitro culture to a 2- to 4-cell stage, 49 in vitro-derived and 105 in vivo-derived embryos were transferred to 6 and 17 recipient does, respectively. One doe and three does of the respective groups were identified as pregnant by ultrasonography on day 30 after embryo transfer. However, only one doe, which had received in vivo-derived embryos, delivered a normal female kid of 1.9 kg on d 149. The cloned kid gained more weight than her age-matched females as much as 87% during the first 4 mo after birth (17.7 vs. $9.4{\pm}0.8$ kg) and reached puberty at 6-mo age a few months earlier than normal female does. The telomere length of the kid, which was similar to that of the donor fibroblast at 2-mo age, decreased 8% between 2- and 7-mo ages. Moreover, at 7-mo age, she had 21% shorter telomere than her age-matched goats. To our knowledge, this is the first case in which a cloned animal born with a normal weight exhibited accelerated growth and development. The unusually rapid growth and development of the cloned goat may have resulted from SCNT-associated epigenetic reprogramming involving telomere shortening.

• Korean Journal of Animal Reproduction
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• v.15 no.1
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• pp.41-47
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• 1991

The ability of fertilization in vitro and subsequent development of superovulated oocytes was assessed in a controlled environment using an in vitro fertilization technique. The in vitro fertilization percentage of oocytes with cumulus mass declined significantly(P<0.05) with increased doses from 4~10 to 16~40IU of PMSG for superovulation. However, the porportion of polyspermic penetration varied from 2.3 to 9.7% and there was no significant difference between treatments in incidence of polyspermy. When morphologically normal ova with cumulus mass were cultured for 66~72h in a plastic mini-straw to undergo fertilization in vitro, the mean percentage of embryos developed to 2-16 and 4-16cell stage was 61.8 and 17.6%; it was slightly(P<0.05) superior to the corresponding results from petri dish. A total of 52 two-cell embryos fertilized in a mini-straw were transferred to seven pseudopregnant rat. Among these recipients, two normal young were born from one recipient which received a total of six embryos. These results suggest that superovulated oocytes are proportionately less competent than normally ovulated oocytes to undergo fertilization in a controlled environment using an in vitro fertilization technique. Also, a plastic mini-straw designed was slightly superior to petri dish as a culture vessel for fertilization and embryo development in vitro.

• Journal of Embryo Transfer
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• v.17 no.3
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• pp.179-185
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• 2002

This study was performed to investigate the effect of different cryoprotectants and superoxide dismutase(SOD) on viability of frozen-thawed oocytes by vitrification method in the pig. The proportions of oocytes matured to metaphase-I stage were higher in medium with ethylene glycol and DMSO(19.9%) than in medium with glycerol and DMSO(6.5%). When the oocytes were exposed in medium containing ethylene glycol, oocyte matured to prophase-I were not observed. On the other hand. significant differences were not observed between in medium with and without SOD( 1 unit/$m\ell$) during IVM of vitrified and thawed immature oocytes. However, the maturation rate from metaphase-I to metaphase-II were higher in medium with that than without SOD. The penetration rates after IVF of oocytes frozen-thawed were also higher in medium with that than without SOD. These results indicate that frozen-thawed oocytes treated with ethylene glycol and DMSO was more protective against freezing effect and that addition of 1 unit/$m\ell$ SOD in medium fur prevent of lipid peroxidation may play a positive role in improving of viability of frozen-thawed oocytes.