Linked Life Data

12041908

Source:http://linkedlifedata.com/resource/pubmed/id/12041908

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pubmed-article:12041908pubmed:abstractTextStudies were conducted to investigate the degree of the cumulus cell expansion and expulsion of the first polar body in relation to time of incubation in three different culture media during in vitro maturation of buffalo oocytes and to suggest a suitable practical method for assessment of in vitro maturation rate of buffalo oocytes. Buffalo oocytes were aspirated from ovaries collected from a local slaughterhouse. Only oocytes with more than two layers of cumulus cells and homogenous ooplasm were cultured into 50 microl droplets of three different culture systems: (1) TCM-199 + steer serum (10%): (2) TCM-199 + steer serum (10%) + PMSG (40 IU/ml); and (3) TCM-199 + steer serum (10%) + PMSG (40 IU/ml) + estradiol 17beta (1 microg/ml) in a 35 mm Petri dish. The droplets were covered with warm (39 degrees C) mineral oil and incubated in a CO2 incubator (39 degrees C, 5% CO2 in air, 90-95% relative humidity) for 16-18, 20, 22, and 24 h. The maturation rate was assessed by evaluation of degree of cumulus cells expansion and identifying first polar body extrusion into the perivitelline space under stereo zoom microscope. Matured oocytes were inseminated in vitro with 9-10 million sperm/ml of Brackett and Oliphant (BO) medium. Cleaved embryos were cultured in TCM-199 supplemented with steer serum (10%) for 8 days. Cumulus expansion and extrusion of first polar body commenced at 16 and 17 h, respectively, of buffalo oocyte culture. These events mainly exhibited during 22-24 h of culture. Oocytes with Degrees 1 and 2 cumulus cells expansion and extruded first polar body in degree 0 oocytes may be considered as matured and can be used in IVF studies.lld:pubmed
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pubmed-article:12041908pubmed:authorpubmed-author:NandiSSlld:pubmed
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pubmed-article:12041908pubmed:pagination1151-9lld:pubmed
pubmed-article:12041908pubmed:dateRevised2003-11-14lld:pubmed
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pubmed-article:12041908pubmed:year2002lld:pubmed
pubmed-article:12041908pubmed:articleTitleTiming of sequential changes in cumulus cells and first polar body extrusion during in vitro maturation of buffalo oocytes.lld:pubmed
pubmed-article:12041908pubmed:affiliationNational Institute of Animal Nutrition and Physiology, Indian Council of Agricultural Research, Adugodi, Bangalore. nandi@nainpbng.kar.nic.inlld:pubmed
pubmed-article:12041908pubmed:publicationTypeJournal Articlelld:pubmed