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- W2022512717 abstract "To date only in vivo-produced embryos have successfully produced live piglets after cryopreservation. In this study, we aimed to produce piglets from vitrified embryos derived from in vitro matured (IVM) oocytes. Cumulus-oocyte complexes collected from ovaries obtained at a local slaughterhouse were matured for 44 to 45 h in NCSU23 MEDIUM supplemented with 0.6 mM cysteine, 10 ng/mL epidermal growth factor, 10% (v/v) porcine follicular fluid, 75 �g/mL potassium penicillin G, 50 �g/mL streptomycin sulfate, and 10 IU/mL eCG/ hCG. These IVM oocytes were either activated for parthenogenesis or in vitro-fertilized (IVF). For IVF, oocytes were incubated with 5 � 106/mL of cryopreserved epididymal sperm in PGM-tac medium (Yoshioka et al. 2003 Biol. Reprod. 69, 2092-2099) for 20 h. Embryos were treated for removal of cytoplasmic lipid droplets (delipation; Nagashima et al. 1995 Nature 374, 416) at the 4- to 8-cell stages, around 50 to 54 h after activation or insemination. After culture in NCSU23 for 15 h, they were vitrified by the minimum volume cooling (MVC) method. Embryos were equilibrated with equilibration solution containing 7.5% (v/v) ethylene glycol (EG), 7.5% (v/v) dimethylsulfoxide (DMSO), and 20% (v/v) calf serum for 4 min, followed by exposure to vitrification solution containing 15% EG, 15% DMSO, 0.5 M sucrose, and 20% calf serum. Embryos were then loaded onto a Cryotop (Kitazato Supply Co., Tokyo, Japan) and immediately plunged into liquid nitrogen. Vitrified embryos were examined for viability in vitro and in vivo after warming. Their in vitro developmental competence was compared to that of corresponding control (nonvitrified) embryos. Vitrified 4- to 8-cell stage embryos, both parthenogenetic and IVF, showed developmental competence into blastocysts comparable to that of control embryos (parthenogenetic: 46.8%, 36/77 vs. 51.7%, 31/60; IVF: 40.0%, 30/75 vs. 44.3%, 35/79). Of four surrogate gilts that received a total of 251 vitrified parthenogenetic embryos, three became pregnant and had 20 fetuses (8.0%, 22 to 23 days old). Three surrogates gilts that received 267 vitrified IVF embryos all became pregnant. Of those, the one that received 47 embryos was confirmed to have eight fetuses (17.0%, 22 days old) by autopsy. The other two were examined by ultrasonography at 56 and 95 days of gestation and found to be pregnant. These results suggest that porcine embryos derived from IVM oocytes have a potential to develop into live offspring after delipation and MVC vitrification. This study was supported by PROBRAIN." @default.
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- W2022512717 date "2006-01-01" @default.
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- W2022512717 title "98 SUCCESSFUL PREGNANCIES FOLLOWING TRANSFER OF VITRIFIED PORCINE EMBRYOS DERIVED FROM IN VITRO-MATURED OOCYTES" @default.
- W2022512717 doi "https://doi.org/10.1071/rdv18n2ab98" @default.
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