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| Registros recuperados: 11 | |
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| Alvarez,Gabriel Martin; Dalvit,Gabriel Carlos; Achi,María Verónica; Miguez,Marcelo Sergio; Cetica,Pablo Daniel. |
| Porcine immature oocyte quality (i.e., that of live oocytes at the germinal vesicle stage) was evaluated according to features of the surrounding cumulus, aiming to establish maturational competence of different subpopulations of such cumulus-oocyte complexes. Six subpopulations were identified: A1 (with a dense cumulus), A2 (with a translucent cumulus), B1 (with the corona radiata), B2 (partly naked oocytes), C (naked oocytes), D (with a dark cumulus). The percent incidence of live oocyte in these subpopulations changed significantly as related to cumulus features, however the occurrence of oocytes in the germinal vesicle stage was lower in class D only. Similar metaphase II rates achieved in A1, A2, B1 and B2 classes after in vitro maturation suggest... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: In vitro maturation; Nuclear maturation; Cytoplasmic maturation; Pig. |
| Ano: 2009 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452009000300005 |
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| DEL COLLADO, M.; SARAIVA, N. Z.; LOPES, F. L.; CRUZ, M. H.; GASPAR, R. C.; OLIVEIRA, C. S.; PERECIN, F.; GARCIA, J. M.. |
| A utilização do soro fetal bovino (SFB), embora bastante disseminada na produção in vitro (PIV) de embriões bovinos, apresenta limitações por ser um meio indefinido e por causar efeitos que prejudicam a qualidade desses embriões. Por esse motivo, nos últimos anos, grande parte das pesquisas relacionadas à PIV está voltada para a substituição do SFB por outros compostos nos meios de cultura. No presente estudo, foram utilizados como compostos protéicos a albumina sérica bovina livre de ácidos graxos (BSA-FAF) e um produto comercial denominado fluido embriônico (FE) de maneira isolada ou em diferentes combinações e concentrações, com objetivo de substituir ou diminuir a concentração do SFB durante a maturação in vitro (MIV). Para isso, oócitos bovinos foram... |
| Tipo: Separatas |
Palavras-chave: Oócitos bovinos; Maturação in vitro; Soro fetal bovino; In vitro maturation; Fetal calf serum.; Cattle; Oocytes.. |
| Ano: 2014 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1003939 |
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| FONSECA, J. F. da; BATISTA, R. I. T. P.; TREVIZAN, J. T.; SOUZA-FABJAN, J. M. G.; BRANDÃO, F. Z.; CAMARGO, L. S. de A.. |
| Abstract We used a goat as a live incubator, along with associated nonsurgical embryo transfer techniques, to perform ex situ (in vivo) maturation of bovine oocytes. Immature bovine cumulus-oocyte complexes (COCs) aspirated from 3-8 mm follicles from slaughterhouse ovaries were randomly split into two groups for in vitro (IVM; n = 38) and ex situ maturation (ESM; n = 40). IVM was performed for a period of 24 h at 38.5 ºC and with 5% CO2 in the air of maximum humidity. For ESM, a presynchronized nulliparous goat (12 months old) received 40 immature COCs in the uterine horn apiece, via the transcervical route. After 24 h the structures were retrieved through uterine flushing. Analyses of nuclear maturation and lipid quantification were performed on oocytes... |
| Tipo: Artigo de periódico |
Palavras-chave: Nonsurgical embryo transfer technique; Ex-situ maturation; In vitro maturation; Bovine oocytes; COCs; Goats. |
| Ano: 2019 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1118709 |
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| Gonzales-Figueroa,H.; Gonzales-Molfino,H.M.. |
| The aim of in vitro maturation oocyte systems is to produce oocytes of comparable quality to those derived in vivo. The present study was designed to examine the surface morphological changes of the cumulus-oocyte complex (COC) and nuclear maturation in a culture system containing pyruvate. Ovaries were obtained from a slaughterhouseand transported to the laboratory within 2 h at 35-39ºC,and rinsed three times in 0.9% NaCl. The COCs were harvested from the ovaries and in vitro maturation was evaluated in San Marcos (SM) medium, a chemically defined culture system containing 22.3 mM sodium pyruvate. Oocytes were cultured in SM, SM + porcine follicular fluid (pFF) and in SM + pFF + gonadotropins (eCG and hCG) for 20-22 h and then without hormonal supplements... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Pig oocytes; In vitro maturation; Pyruvate; Cumulus cells. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000600008 |
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| Quetglas,M.D.; Coelho,L.A.; Garcia,J.M.; Oliveira Filho,E.B.; Esper,C.R.. |
| The effects of insulin-like growth factor-I (IGF-I) on in vitro maturation (IVM) (experiment I) and on in vitro embryo development (experiment II) of bovine oocytes fertilized in vitro, were evaluated in terms of cleavage (CR), blastocyst (BR) and hatching (HR) rates. For IVM, immature cumulus-oocyte complexes were cultured in TCM-199 medium supplemented with Hepes, sodium bicarbonate, sodium pyruvate, additives, fetal calf serum (B-199 medium) and gonadotropins (14 U/ml PMSG and 7 U/ml hCG). For embryo development, the oocytes/zygotes were cultured in B-199 medium with bovine oviduct epithelial cells in suspension under silicon oil. Treatments for in vitro culture conditions for both experiments were: 1- B-199 + 200 ng/ml IGF-I; 2- B-199 + 100 ng/ml... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bovine; Cleavage rate; IGF-I; In vitro maturation; In vitro fertilization. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352001000200014 |
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| Wang,Zhengguang; Fu,Chunquan; Yu,Songdong. |
| The present study examined the effects of green tea polyphenols (GTP), insulin-like growth factor-I (IGF-I) and glucose on oocyte in vitro maturation, subsequent embryo development and blastocyst quality in bovine. Cumulus-oocyte complexes (COC) were aspirated from the ovaries and cultured in synthetic oviduct fluid supplemented with MEM amino acids (SOFaa) media supplemented with one of the following supplements: GTP (0, 10, 15 and 20 µM), IGF-I (0, 50, 100 and 150 ng/mL) or glucose (0, 1.5, 5.6 and 20 mM) for 24 h. The results showed that oocytes cultured in media supplemented with 15 µM GTP, 100 ng/mL IGF-I and 5.6 mM glucose, in separate experiments, have higher cleavage and blastocyst rates compared with oocytes cultured in media without or with other... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Blastocyst quality; Embryo development; In vitro culture; In vitro maturation. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012001200006 |
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| Registros recuperados: 11 | |
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