• Title/Summary/Keyword: Fertilization rates

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Control of Sperm Penetration In Vitro by Cumulus Cells in Porcine Oocytes (돼지의 체외수정시 난구세포에 의한 정자침입의 조절)

  • Park, C.K.;Cheong, H.T.;Lee, J.H.;Kim, I.C.;Yang, B.K.;Kim, C.I.
    • Korean Journal of Animal Reproduction
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    • v.23 no.2
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    • pp.149-157
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    • 1999
  • The functional role of cumulus cells on the penetration and polyspermy during in vitro fertilization in porcine was examined. The penetration rate was significantly higher (P<0.01) in oocytes with (61%) than without (25%) cumulus cells, but significant differences in polysper-my rates were not observed. When hyaluronidase was added to the fertilization medium with different concentrations, penetration rates in oocytes with cumulus cells were higher than in oocytes without cumulus cells at 0 (61% vs 34% ; P<0.05), 0.01 (56% vs 35% ; P<0.05), 0.1 (66% vs 30% ; P<0.05) and 1.0mg/$m\ell$ (39% vs 27%). The polyspermy rates were lower in oocytes without than with cumulus cells, and had a tendency to decrease with high concentrations of hyaluronidase. In another experiment, the penetration and polyspermy rates had a tendency to increase as time of sperm-oocyte culture was prolonged. At 16 and 20 h after insemination, the penetration rates were significantly higher (P<0.05) in oocytes with (48 and 62% for 16 and 20 h) than without (25 and 31% for 16 and 20 h) cumulus cells in medium containing hyaluronidase. Polyspermy rates were significantly (P<0.05) lower in oocytes without (13% and 16%) than with (37% and 48%) cumulus cells at 16 and 20 h after insemination. In cumulus-free oocytes inseminated in medium containing different concentrations of cumulus cells, the penetration rates were significantly (P<0.05) higher in medium with than without hyaluronidase. The proportion of polyspermy was lower in medium without than with hyaluronidase at 0 (10% vs 0%), 10$^2$(25% vs 0%), 10$^4$(24% vs 14%) and 10$^{6}$ (29% vs 10% ; P<0.05) cumulus cells/$m\ell$. These results suggest that cumulus cells can have a positive influence on sperm penetration, its action on polyspermy control does appear to function primarily on zona pellucida by co-culture of cumulus cells and oocytes in medium without hyaluronidase.

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Development Capacity of Bovine Oocytes Matured and Fertilized In Vitro (체외성숙 및 수정된 우 난포란의 발생능)

  • 서태광;박수봉;박항균
    • Korean Journal of Animal Reproduction
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    • v.14 no.1
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    • pp.17-22
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    • 1990
  • The present study was carried to investigate the development potential of bovine follicular oocytes matured and fertilized in vitro. Bovine oocytes matured in vitro were fertilized, cultured, and transfered to the rabbit oviduct for in vitro culture to evaluate the development potential. The rates of in vitro maturation, fertilization and polyspermy were 96%(355/369), 90%(320/355) and 15%(17/320), respectively. The percentage of oocytes cleaved after culture for 48 hours, to 2 cell, 3~4 cell, 6~8 cell stage were 17%(60/356), 21%(75/356) and 19%(67/356), respectively and overall cleavage rate was 57%(202/356). The rate of recovered embryos after 5 days in rabbit oviduct was 56%(80/142), and 21%(17/80) of recovered embryos developed over morula stage.

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Study on the Factors Influencing Fertilization and Developmental Rate of In Vitro Cultured Cat Oocytes Recovered from Ovaries Collected at Different Stages of the Reproductive Cycle

  • Quan, J. H.;Kim, S. K.
    • Proceedings of the KSAR Conference
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    • 2004.06a
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    • pp.257-257
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    • 2004
  • The study was carried out to investigate the effects of morphology, reproductive cycle, incubation time and activation of oocytes on in vitro maturation of cat oocytes and development of IVM/IVF embryos. 1. When recovered from ovaries collected at different stages of the reproductive cycle (inactive, follicular and luteal stage), the developmental rates of oocytes to GV and MI stage were 72.5% and 27.5%, 57.5% and 7.5%, 62.5% and 17.5%, respectively. (omitted)

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Case Reports of 6 Female Infertile (여성불임환자 6례의 임상보고)

  • Cho, Seong-Hee;Yang, Seung-Jeong
    • The Journal of Korean Obstetrics and Gynecology
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    • v.27 no.2
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    • pp.103-110
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    • 2014
  • Objectives: This study was performed to assess whether herbal medicine and acupuncture is effective on clinical pregnancy. Methods: From february 2013 to july 2013, a prospective analysis study was performed in 6 patients after taking her medicine and acupuncture treatment. Results: After treatment, one patients naturally became pregnance and one patients became pregnance after in vitro fertilization-embryo transfer (IVF-ET). Conclusions: This study suggests that herbal medicine and acupuncture treatment shows possibility to increasing pregnancy rates.

Effects of Cryoprotectants and Freezing Rates on Cryopreservation of Catfish, Silurus asotus Sperm

  • Kho, Kang Hee;Kang, Kyoung Ho
    • Journal of Aquaculture
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    • v.17 no.1
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    • pp.8-11
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    • 2004
  • Milt of the catfish was stripped into immobilizing solution containing 175 mM NaCl and 30 mM Tris at pH 7.8 and was successfully cryopreserved after a stepwise freezing procedure. After stepwise thawing, motility of spermatozoa was slightly lower than that of fresh sperm. Batches of 40-80 eggs were fertilized with cryopreserved spermatozoa, after thawing and activation in solution containing 50 mM NaCl, 20 mM Tris and HCl at pH 7.8; this resulted in 62.2% fertilization success, compared to 70.6 % with fresh sperm.

Production, Cryopreservation and Transfer of Bovine Embryos Cultured in Serum-Free Medium

  • Hoshi, Hiroyoshi
    • Proceedings of the Korean Society of Embryo Transfer Conference
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    • 2002.11a
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    • pp.3-7
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    • 2002
  • In vitro embryo culture techniques provide significant contributions not only for a basic research of fertilization and early embryogenesis, but also for a low cost mass production of bovine embryos for transfer, embryo diagnosis, nuclear cloning and the production of transgenic cows. This presentation introduces newly developed serum-free media (IVD101 and IVMD101) that are effective far high yields of transferable embryos of excellent quality from in vitro-matured and fertilized oocytes. Both serum-free media are superior to a conventional serum-containing medium on the increased rates of blastocyst formation, post-thaw embryo viability, and pregnancy after transfer. Furthermore, reduced risks of calf mortality and large calf syndrome are also observed for the serum-free-derived embryos. Serum-derived embryos contain a large number of lipid droplets and immature mitochondria in their cytoplasm that may account for the lower production of transferable embryos and poor embryo quality.

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Temperature-dependent Index of Mitotic Interval (τ0) for Chromosome Manipulation in Korean Rose Bitterling Rhodeus uyekii

  • Kim, Bong-Seok;Lim, Sang-Gu;Gil, Hyun-Woo;Park, In-Seok
    • Fisheries and Aquatic Sciences
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    • v.14 no.4
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    • pp.429-433
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    • 2011
  • Eggs of Korean rose bitterling Rhodeus uyekii were collected and fertilized to observe temperature-related cleavage rates and mitotic intervals (${\tau}_0$). As the water temperature was increased, the slope of first cleavage frequency with elapsed time after fertilization increased, and approximately 30% of fertilized eggs reached first cleavage frequency at every 15 min. At higher temperatures, eggs developed faster and underwent further identical developmental processes. There were strong, negative correlations between ${\tau}_0$ and water temperatures at all temperatures studied (Y = -1.225X + 70.05, $r^2=0.988$, where Y is ${\tau}_0$ and X is temperature).

Cryopreservation of Semen in Dead Yellow Croaker, Larimichthys polyactis

  • Lim, Han-Kyu;Min, Byung-Hwa;Jeong, Min-Hwan;Choi, Byul-Nim;Le, Minh Hoang;Chang, Young-Jin
    • Fisheries and Aquatic Sciences
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    • v.13 no.4
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    • pp.350-353
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    • 2010
  • This study demonstrated that cryopreserved semen from dead fish can be used for seedling production. Yellow croakers, Larimichthys polyactis, were killed and stored at temperatures of $20^{\circ}C$ or $0^{\circ}C$ for 6 hours. At 2 hour intervals, semen from these fish was collected using abdominal pressure and evaluated for spermatozoa motility and semen cryopreservation. Semen collected after 6 hours from dead fish stored at $0^{\circ}C$ could be cryopreserved and attained fertilization and hatching rates of $15.0{\pm}1.2%$ and $14.8{\pm}1.6%$, respectively. This study suggests that germ cells such as the semen of dead fish can be cryopreserved and utilized in the restoration of a species.

Egg Development and Mitotic Interval (τ0) in Black Plaice, Pleuronectes obscurus (Herzenstein)

  • Park, In-Seok;Im, Soo-Yeon
    • Fisheries and Aquatic Sciences
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    • v.13 no.4
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    • pp.278-283
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    • 2010
  • Black plaice, Pleuronectes obscurus (Herzenstein), were collected and fertilized to observe egg development, temperature-related cleavage rates, and mitotic intervals (${\tau}_0$). Fertilized egg was demersal, adhesive, and did not contain oil globules. After 1.75 h, the blastodisc formed, and hatching took place 121 h after fertilization at $14^{\circ}C$. The hatched larvae were $3.5{\pm}0.16\;mm$ in total length. At higher temperatures, eggs developed faster and underwent further identical developmental processes. Additionally, ${\tau}_0$ and water temperature were strongly negatively correlated at all temperatures (Y=-2.6981X+98.767, $R^2$=0.9831, where Y is ${\tau}_0$, and X is temperature) for black plaice.