• 대한생식의학회:학술대회논문집
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• 2003.12a
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• pp.101-102
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• 2003

• Journal of The Korean Society of Grassland and Forage Science
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• v.38 no.4
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• pp.320-324
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• 2018

In this study, we examined effect of sperm penetration of oocytes after in vitro fertilization (IVF) with cauda epididymal spermatozoa in Hanwoo bull after feeding of timothy hay. One testicle with epididymides was castrated from one Hanwoo bull (14 months of age) and spermatozoa recovered from cauda epididymis and cryopreserved. As control, frozen Hanwoo semen was used. Matured cumulus oocyte complexes were co-incubated with frozen-thawed cauda epididymal spermatozoa for 12 or 18 hours. After IVF, presumptive zygotes were cultured in modified synthetic oviductal fluid. In experiment 1, we examined sperm penetration rate at 12 hours of IVF with epididymal sperm. Total penetration rate among cauda epididymis and control was similar(mean${\pm}$standard error, cauda epididymis and control vs. $49.7{\pm}11.3$ and $54.4{\pm}12.8%$). In experiment 2, cleavage and blastocyst developmental rate were evaluated at day 2 and day 8 after IVF for 18 hours. Cleavage rate among cauda epididymis and control was similar(cauda epididymis and control vs. $81.2{\pm}3.4$ and $82.7{\pm}2.5%$). However, blastocyst developmental rate of cauda epididymis group was significantly higher than that of control group(cauda epididymis and control vs. $24.4{\pm}1.6$ and $12.2{\pm}2.8%$, p<0.05). In conclusion, cauda epididymal spermatozoa in Hanwoo bull has high embryo developmental competence and can be used as an alternative to ejaculated frozen sperm in vitro.

• Journal of Embryo Transfer
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• v.10 no.2
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• pp.131-138
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• 1995

Essential and non-essential amino acids supplemented to culture medium stimulate mammalian embryo development in vitro. Amino acids such as glycine, taurine and alanine are concentrated in the lumen of oviduct and uterus and it can he thought that these amino acids may have physiological role on fertilization and embryo development. Our aim of this experiment was to investigate the effects of essential and non-essential amino acids, taurine or glycine supplemented to fertilization medium on the cleavage and subsequent in vitro development of bovine oocytes matured and fertilized in vitro. Immature oocytes were obtained from slaughtered Holstein cows and heifers and matured in TCM199 containing 10% fetal calf serum, 2.5 $\mu$g /mL of FSH and LH and 1 $\mu$g / mL of estradiol with granulosa cells in vitro. After maturation, oocytes were coincubated with sperm in fertilization medium supplemented with Minimum Essential Medium (MEM) essential and non-essential amino acids, taurine (3.75 mM) or glycine (10 mM) for 30 hours in vitro. Inseminated oocytes were cultured in synthetic oviduct fluid medium (SOEM) containing MEM essential, non-essential amino acids and 1 mM glutarnine up to 8 days after fertilization.Supplementation of fertilization medium with MEM essential and non-essential amino acids lowered significantly (p<0.05 and p<0.001) the cleavage rate after 30 hours of IVF (53.3%) and at Day 3 (62.7%: Day 0: the day of I VF) compared to control (64.3% and 77.3%, respectively). Subsequent developmental rates to morulae (Mo) and expanding blastocysts (ExBL) also significantly decreased (p<0.001 and p<0.05 for Mo and ExBL) when oocytes were coincubated with sperm in the medium containing MEM amino acids. Taurine added to fertilization medium have not increased the cleavage rate over the control, whereas glycine showed significantly lower (p<0.01) cleavage rate at Day 3 than that of taurine, but there was no significant difference in the developmental rates to Mo and ExBL of bovine embryos irrespective of the supplementation of taurine or glycine to fertilization medium. In conclusion, supplementation of fertilization medium with essential and non-essential amino acids, taurine or glycine has no beneficial effect on in vitro cleavage and development of bovine oocytes matured and fertilization in vitro.

• Clinical and Experimental Reproductive Medicine
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• v.26 no.3
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• pp.355-362
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• 1999

Objective: This study was performed to compare the clinical response to controlled ovarian hyperstimulation (COH) of in vitro fertilization and embryo transfer (IVF-ET) according to the size of baseline ovarian cyst. Method: From February 1992 to March 1999, a retrospective analysis was done of 272 cases who underwent COH using mid-luteal phase long protocol of gonadotropin-releasing hormone agonist (GnRH-a) for IVF-ET. These cases were divided into four group; group 1 (n=63) had cysts with mean diameters between 20.0 and 29.0 mm on their baseline ultrasound on cycle day 3, group 2 (n=57, $30.0{\sim}49.0mm$), group 3 (n=68, >50.0 mm) and control group (n=84). Cases were excluded according to the following criteria; pure male factor infertility, the presence of only one ovary, high CA-125 level and previous endometriosis. Results: There were no statistically significant differences between cases with baseline ovarian cyst <50.0 mm in diameter and control group in any of the parameters. However, cases with baseline ovarian cyst>50.0 mm in mean diameter needed more amount of human menopausal gonadotropin (hMG), showed significantly lower estradiol ($E_2$) level, the number of follicle >15.0 mm on the day of human chorionic gonadotropin (hCG) administration, the number of oocytes retrieved, the number of mature oocytes, and pregnancy rate compared with control group. Conclusion: This study suggests that cases with baseline ovarian cyst <50.0 mm in diameter do not adversely impact on IVF-ET outcome. However, cases with baseline ovarian cyst >50.0 mm in diameter had adverse effects on various parameters. Therefore, to improve the outcome of IVF-ET in these cases, ovarian cyst aspiration prior to initiating COH may be required.

• Clinical and Experimental Reproductive Medicine
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• v.24 no.3
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• pp.361-368
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• 1997

A total of 55 patients with various etiologies of infertility particitated in a study comparing two regimens of controlled ovarian hyperstimulation (COH) with GnRH agonists and gonadotropins. Nineteen patients were given an ultra-short stimulation protocol when the agonist was administered for 3 day from Day 2 of the cycle. The remaining 36 patients were given a long stimulation protocol when the agonist was administered from the mid-luteal phase of the cycle preceding the stimulation cycle. The mean number of gonadotropins used per patient was not different between two groups. No significant differences were found in the mean number of oocytes recovered, fertilization rate and embryo cleavage rate between two groups. Pregnancy and delivery rates were higher in ultra-short protocol than in long protocol, but these were not significant. These results suggest that an ultra-short protocol is as effective as a long protocol in in-vitro fertilization and embryo transfer.

• Journal of Embryo Transfer
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• v.24 no.3
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• pp.145-150
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• 2009

This study was conducted to examine the effects of human follicular fluid and gonadotropin (FSH+HCG+rhEGF) on in vitro maturation, fertilization and development of human immature oocytes. Cumulus-oocyte complexes (COCs) were collected following for in vitro fertilization and embryo transfer (IVF-ET) cycles of the patients. At the time of oocytes collection, oocytes were classified into MII, MI and GV in accordance with their appearance (MII: Fully mature oocyte at metaphase II of meiosis; MI: Nearly mature oocytes at metaphase I of meiosis; GV: Immature oocytes at prophase I of meiosis). After controlled ovarian stimulation using gonadotropin(FSH) and human chorionic gonadotropin (HCG) in 70 ICSI cycles, 158 MI to MII matured oocytes were intracytoplasmic sperm injection (ICSI) ${\sim}4$ h after in vitro culture and 553 MII oocytes were ICSI after denudation. The aspirated MI and GV oocytes were cultured in culture medium containing 10% (v/v) serum protein substitute (SPS), 10% (v/v) human follicular fluid (hFF) and 10% (v/v) serum protein substitute (SPS)+1 IU/ml FSH+10 IU/ml HCG+10 ng/ml recombinant human epidermal growth factor (rhEGF). The maturation rate of immature oocytes was similar among the three group. When maturation medium was supplemented with 10% SPS, 10% hFF or gonadotropins, the fertilization rate of in vitro matured oocytes was higher in 10% SPS (80.0%), but there was no statistical significance (78.2%; hFF, 76.9%; gonadotropin, p>0.05). The development rate of human embryos developed to $6{\sim}8$ cells were not significant difference in the medium containing SPS, hFF and gonadotropins (65.6%, 65.9% and 66.7%). The results of these study suggest that human follicular fluid and gonadotropins supplemented in the culture medium was not effected on the in vitro maturation, fertilization and development of human immature oocytes.

• Proceedings of the KSAR Conference
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• 2003.06a
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• pp.57-57
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• 2003

수정란의 체외생산(IVP)기술은 동물생산기술의 적용과 생리학이나 세포생물학의 기본 연구에 새로운 biotchnologies의 발생에 있어 매우 중요하고 흥미로운 사건으로서 여러 종류의 포유류에 적용되고 있다. 이러한 기술은 3가지의 절차를 밟아야 하는데 In vitro maturation(IVM), In vitro fertilization(IVF) 및 In vitro development(culture)(IVD)가 그것이다. 그런데 돼지는 다태동물로서 난소의 난포가 성장할 때 난포간 meiotic competence가 난자에 의하여 진행되므로 난포내의 난포액에 의하여 난자의 발육이 좌우된다고 보고 있다 돼지WP에 사용되는 난자는 난포의 직경이 3~5mm에서 수집하고 cumulus-oocyte complexes(COCs)의 형태에 따라 선택하는 것이 보편화되어 있다. 실험목적은 돼지 난소의 antral follicles이 성장할 때 크기에 의하여 oocyte meiotic competence의 방출에 어떤 영향을 주는지를 난자의 체외성숙과 체외수정 및 체외발육 비율을 각각 조사하여 미성숙 난자의 체외배양 기술을 개선할 목적이었다. 수행내용은 도축돈 난소의 난포크기별 3mm<, 3~5mm, 5mm)로 나누어, 다시 말해서 preantral stage, antral stage, postantral stage으로 구분하여 채취한 COCs를 IVM, IVF, IVC 상태에서의 COCs 형태, cell cleaved rate, developmental rate 등을 조사하였다.

• Asian-Australasian Journal of Animal Sciences
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• v.14 no.8
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• pp.1188-1195
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• 2001

A tetraparental chimeric bull was successfully produced by aggregating bovine IVF embryos of F1 (female Holstein${\times}$male Japanese Black) and F1(female Japanese Brown${\times}$male Limousin) and culturing in vitro without the zona pellucida at Yamaguchi Research Station in Japan. In the microsatellite genotyping, 12% (28/228) microsatellite primer sets ware potentially useful for this parentage analysis in the chimeric bull, 78.6% (22/28) of microsatellite present in the chimeric bull were uniquely contributed from the Japanese Black and 21.4% (6/28) from Limousin. This chimeric bull semen was used in producing IVF embryos. The chromosome preparations were made from peripheral lymphocytes. Based on chromosome analysis the Chimera had apparently normal chromosomes (29 acrocentric pairs, one large sub metacentric X chromosome and one small sub metacentric Y chromosome). The proportion of acrosome reacted spermatozoa after 1 h of incubation was higher (p<0.01) with the Chimera than with the Holstein and in Japanese Brown bulls. But did not differ from Japanese Black and Limousin bull sperm. Fertilization rates observed after 5 h of sperm-oocyte incubation with Chimera sperm were higher (p<0.05) than with Japanese Brown and (p<0.01) than with Holstein sperm, but did not differ from Japanese Black and Limousin sperm. The cleavage rates of IVF oocytes inseminated with Chimera sperm were also higher (p<0.001) compared with Holstein, (p<0.01) Japanese Brown and (p<0.05) Limousin, but did not differ from Japanese Black sperm. The blastocyst rates of IVM oocytes inseminated with sperm were higher (p<0.05) than in Limousin, Japanese Brown and Holstein, but did not differ from Japanese Black. Chimeric cattles were produced by aggregation of parthenogenetic (Japanese Brown) and in vitro fertilized (Holstein) bovine embryos at the Yamaguchi Research Station in Japan and by aggregation of parthenogenetic (Red Angus) and in vitro fertilized (Holstein) embryos at the St. Gabriel Research Station in Louisiana. The aggregation rate of the reconstructed demi-embryos cultured in vitro without agar embedding was significantly lower than with agar embedding. The aggregation was also lower when the aggregation resulted from a whole parthenogenetic and IVF-derieved embryos cultured without agar than when cultured with agar. The development rate to blastocysts, however, was not different among the treatment. To verify parthenogenetic and the cells derieved from the male IVF embryos in blastocyst formation, 51 embryos were karyotyped, resulting in 27 embryos having both XX and XY chromosome plates in the same sample, 14 embryos with XY and 10 embryos with XX. The viability and the percentage of zonafree chimeric embryos at 24 h following cryopreservation in EG plus T with 10% PVP were significantly greater than those cryopreserved without PVP. Pregnancies were diagnosed in both stations after the transfer of chimeric blastocysts. Twin male and single chimeric calves were delivered at the Yamaguchi station, with each having both XX and XY chromosomes detected. Three pregnancies resulted from the transfer of 40 chimeric embryos at the Louisiana station. Two pregnancies were Jost prior to 4 months and one phenotypically chimeric viable male born.

• Reproductive and Developmental Biology
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• v.31 no.1
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• pp.49-53
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• 2007

Astaxanthin is a kind of carotenoid compounds, having a antioxidant and anti-inflammatory activities. The antioxidative mechanism by which carotenoid scavenge free radicals has been clearly elucidated, but has not tried for the development of mammalian preimplantation embryo. This study was conducted to investigate the antioxidative effect of astaxanthin on in vitro development of porcine in vitro fertilized embryos. Porcine embryos derrived from in vitro fertilization (IVF) were cultured in 5% $CO_{2} in air at $38.5^{\circ}C$ in PZM-3 medium supplemented with different dosages of astaxanthin ($0,\;1,\;5\;and\;10{\mu}M$) and taurine (0, 1, 2.5 and 5 mM) as a positive control, and execute to compare the effects of various antioxidants such as taurine, melatonin and asculatin on in vitro development. The proportions of embryos developed to the blastocyst stage were increased when $1\;and\;5\;{\mu}M$ of astaxanthin (26.6 and 23.4%, respectively) and 1 and 2.5 mM taurine (25.8 and 26.4%, Respectively) were supplemented, compared to controls (p<0.05). Also, various antioxidant-treated groups were significantly higher rates of blastocysts (astaxanthin, 27.4%; taurine, 29.1%; melatonin, 26.8%; aesculetin, 27.9%, respectively) than control (18.8%). There was no difference in mean cell number of blastocysts between antioxidants and control. This result indicates that astaxanthin has an antioxidant feature when porcine IVF embryos were cultured in vitro.

• Journal of Embryo Transfer
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• v.19 no.3
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• pp.245-255
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• 2004

In recent years, an increasing number of studies on pig in vitro maturation(IVM) and in vitro fertilization(IVF) have been separated. the wide range of new technologies, including that in applied molecular genetics, has increased this interest. the production of viable porcine embryos in vitro is a prerequisites for the successful production of transgenic pigs to date. The efficiency of IVM/IVF techniques in the porcine is lower than that obtained in other species such as cattle and mouse. The several problems are generally thought to be the cause of poor results: the low rate of MPN formation derived from inadequate IVM of oocytes, the high incidence of polyspermy after IVF and cell blocking at 4 cell during embryos culture. For there reasons overcoming, many studies have been conducted to improve in vitro embryo-genic competence of oocytes. In the last several years, many maturation culture media have been evaluated and various exogenous factors such as hormones and grows factors have been tested to improve the efficiency of porcine in vitro system. In the study several antioxidants have been examined to improve in vitro fertilization and development of porcine oocytes. In this study, several antioxidants were examined to determine the effects on the development of oocytes to the cleavage, morula and blastocyst stage when added at the maturation(IVM) or in vitro fertilization(IVF) or in vitro culture(IVC) of porcine embryos. Porcine oocytes were matured, fertilized and embryos were cultured in defind conditioned medium in vitro with or without supplementation with the antioxidents of cysteine, catalase and glutathione. 1. Significant improvement of blastocyst rate (27.2％ versus 15.4％, p<0.05) were achieved when catalase(500U/$m\ell$) were added to TCM-199 medium and morula rate(72.0％ versus 53.9％, p<0.05) were significantly higher when glutathione(1.0mM/$m\ell$) were added to TCM-199 medium than those of control. 2. In mTBM medium for oocytes fertilization, the addition of cysteine, catalase and glutathione had no positive effect on embryonic development. glutathione had no positive effect on embryonic development. In conclusion, this study shows that addition of catalase, gluththione during IVM improved the rate of porcine embryo development.