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• W2018807107 abstract "The aim of this work was to determine the effect of follicle size on camel oocyte quality as measured by developmental competence in vitro and in vivo. Ovaries from a local slaughterhouse were dissected to obtain two classes of follicle size: small (3–6 mm) and large (>6 mm) follicles. Quality of the oocytes was assessed after in vitro maturation (IVM), in vitro fertilization (IVF) and in vitro culture (IVC) of cumulus oocyte complexes (COCs). All cultures were done in four replicates at 38.5 °C, under 5% CO2 and high humidity (>95%). Only COCs with cumulus and homogenous (dark) cytoplasm were used. The COCs were matured for 28 h in TCM-199 medium supplemented with 10% heat-treated fetal calf serum (FCS), 10 ng/mL EGF, and 250 μM cysteamine. Nuclear maturation rate for each class of follicle size was determined by contrast phase microscopy in a sample of COCs (n = 30) denuded, fixed and stained with aceto-orcein. In vitro fertilization was performed using fresh semen (0.5 × 106 spermatozoa/mL in modified TALP-solution). Fertilized oocytes were cultured in mKSOMaa, under 5% O2 and 90% N2. The percentage of COCs reaching metaphase II (MII) after 28 h of maturation was 87% (26/30) and 73% (22/30) for oocytes originating from large and small follicles, respectively (P > 0.1). The rate of total cleavage (two cells to blastocyst stage) was greater (P < 0.05) for oocytes originating from large follicles (72%; 116/162) than for those derived from small follicles (59%; 140/237). The percentage of fertilized oocytes reaching the blastocyst stage was 35% (57/162) and 20% (48/237) for oocytes collected from large and small follicles, respectively (P < 0.05). The viability of in vitro-produced hatched blastocyst from the two groups (15 from 3 to 6 mm follicle size and 22 from follicles >6 mm) was assessed by transfer to synchronized recipients. None of the hatched blastocysts from small follicles resulted in a pregnancy whereas 68% (15/22) of the transferred hatched embryos from large follicles developed into a 25-day pregnancy. Of the resulting 15 pregnancies, 53% (n = 8) aborted (five between 2 and 4 months and three between 5 and 7 months of pregnancy). The remaining seven pregnant females gave birth to normal healthy offsprings (four females and three males). The present study shows that dromedary oocytes developmental competence is acquired late during the final phase of follicular development and this developmental ability translates into greater pregnancy rates after transfer of in vitro produced hatched blastocysts." @default.
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• W2018807107 date "2007-06-01" @default.
• W2018807107 modified "2023-10-17" @default.
• W2018807107 title "Effect of follicular size on in vitro developmental competence of oocytes and viability of embryos after transfer in the dromedary (Camelus dromedarius)" @default.
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• W2018807107 doi "https://doi.org/10.1016/j.anireprosci.2006.06.015" @default.
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