To develop an effective vitrification method, we examined the use of a conventional straw as vessel fur vitrification of mouse oocytes, and to compare the post-thaw survival and chromosome configuration of these oocytes with those vitrified in grids. Intact cumulus-enclosed oocytes were vitrified with DPBS with 5.5 M ethylene glycol and 1.0 M sucrose, and loaded into straws and onto eletron microscopic copper grid fur storing in liquid nitrogen. Intact vitrified and thawed oocytes were karyotying for chromosome. The rates of post-thawed survival were 88.5% in vitrified oocytes with straws, and 83% in vitrified ooctyes with grids. Vitrified and thawed oocytes with straws and grids were increased chromosomal abnormality (31.4% and 30.9%) compared with fresh oocytes (17.8%). The conventional straws can be used as vessel for vitrification to prevent of inflection in liquid nitrogen.

본 연구는 돼지 난포란의 체외성숙배양액에 superoxide dismutase(SOD)를 첨가배양하여 체외성숙과 수성이후 배발달에 미치는 영향과 산소농도 및 SOD가 체외생산된 돼지초기수정란치 배발달에 미치는 영향을 규명하고자 실시하였다. 본 연구에서 얻어진 결과를 요약하면 다음과 같다. 1. 돼지 난포란을 체외성숙배양액인 NCSU-23에 SOD를 각각 0, 100,500 및 1,000uni1s/m1 첨가하여 성숙시킨 다음, 체외수정을 실시한 결과, 핵

본 연구는 돼지 난포란의 체외성숙에 적합한 배양액을 조사하고, 아울러 산소농도가 돼지 난포란을 이용한 체외수정란의 생산에 미치는 영향을 구명하고자 실시하였다. 본 연구에서 얻어진 결과를 요약하면 다음과 같다. 1. NCSU-23과 TCM-199 배양액에 10% PFF를 첨가하여 5% 및 20% 산소조건하에서 체외성숙을 유기한 결과, 배양액 및 산소조건에 따른 난핵붕괴률 및 핵성숙률에는 유의적 (P>0.05)인 차이가 없었다. 2. NCSU-23이 TCM

유전적으로 우수한 능력을 보유하고 있으나 정상적으로 번식이 불가능한 젖소 16두를 간이 난자 체취기를 이용하거나 장기공태 젖소 5두를 초음파 난자체취기를 이용하여 미성숙난자를 채취하므로서 체외수정란을 안정적으로 생산하기 위해 채취기기의 효율성과 반복채란에 미치는 영향을 조사한 결과는 다음과 같다. 1 공란우당 채취회수는 간이 난자 체취기 8.8회였고, 초음파기기는 8.8회였으며, 공란우당 평균 회수된 난포란은 각각 4.39개와 4.14개로 채취기기간에

본 연구는 phosphatidylinositol 대사의 기질 및 억제물질이 돼지 난모세포의 체외 성숙·수정에 미치는 영향에 대하여 실험을 하였다. 난모세를 inositol (250 mM) 첨가 또는 무첨가한 mTLP-PVA 배양액에서 46시간 체외배양하였다. 성숙이 완료된 난모세포는 신선 돼지정액을 이용하여 6시간 동안 mTALP-PVA 배양액에서 체외수정을 시켰다. 수정 후 6시간에 이들 난모세포를 10% 혈청을 첨가한 TCM-199 배양액에서 추가로

This study was carried out to evaluate the effect of culture methods on development of embryos with each developmental stage after heat shock in bovine oocytes. The results obtained were as fellows. 1. The culture method after heat shock on development of embryos was better drop-culture than co-culture. 2. The medium without amino acids were not effect of heat sock on development of embryos but it was in need of amino acid during formation of blastocyst.

This study was conducted to examine the effects of exogenous gonadotropins (PMSG+hCG) and an antioxidant (cysteine) on in vitro maturation of bovine follicular oocytes. Cumulus-oocyte complexes (COCs) aspirated from 2 to 5 mm ovarian follicles were cultured for 22 to 24 hours in a modified bovine embryo culture medium (mBECM) supplemented with 3 mg/mL bovine serum albumin, to which PMSG (10 IU/mL) + hCG (10 IU/mL) and/or cysteine (0.6 mM) were added. When examined the expansion of cumulus ce1ls at the end of maturation culture, greater (p<0.05) expansion was found after addition of PMSG+hCG (79 to 96%) to mBECM than after no addition (0%), regardless of the presence or absence of cysteine in the medium. The addition of cysteine did not stimulate cumulus expansion, but a high proportion (92%) of expansion was achieved when COCs were cultured after the addition of PMSG+hCG and cysteine to the medium. No difference in the proportion of oocytes underwent germinal vesicle breakdown (initiation of maturation) was found after the addition of PMSG+hCG and/or cysteine to mBECM. However, nuclear maturation (development to the metaphase-II stage) of oocytes was significantly stimulated by the combined addition of PMSG+hCG and cysteine, compared with no addition. In conclusion, both exogenous gonadotropins and an antioxidant are important for nuclear maturation of bovine immature oocytes and these factors have a cell-specific stimulatory action.