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In vitro maturation of porcine oocytes in follicular fluid with subsequent effects on fertilization and embyo yield in vitro.

Theriogenology 1995 September
The objective of the present study was to test the ability of porcine follicular fluid (pFF) to improve maturation of porcine cumulus-oocyte-complexes (COC) in vitro and to observe subsequent effects on fertilization and development to late morula/blastocyst stages under in vitro conditions. The COC were incubated in Tissue Culture Medium (TCM) 199, supplemented with 1% fetal calf serum (FCS), 10% pFF collected from immature follicles (2 to 5 mm), with or without addition of 1microg/ml FSH. Control groups were matured in TCM 199 with or without FSH. Follicular aspirates were centrifuged (1700 x g, 5min.) and the supematants were stored at -20 degrees in 1.5-ml Eppendorff cups until used. On 7 experimental days a total of 3849 immature COC was aspirated from follicles ranging from 2 to 5 mm in diameter. A total of 1117 COC was selected for the experiments, and 239 COC were fixed and stained with 1.5% aceto-orcein after 48 h of in vitro maturation at 39 degrees C with 5% CO(2) in humidified air. Germinal vesicle breakdown (GVBD; 91.7%) and development to metaphase II (60.4%) were superior (P

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