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• W2053642870 abstract "This research concerned effects of cooling in vitro matured bovine oocytes on subsequent fertilization and development in vitro. Oocytes were maintained at 39 degrees C (control), 20 degrees C, 10 degrees C or 0 degree C for 5, 10, or 20 min, then fertilized and cultured in vitro for 7 d. The proportion of fertilized oocytes that cleaved and developed to the morula/blastocyst stage was compared between different treatments. Duration of exposure had no effect on the results. Fertilization rate was higher (P < 0.05) for oocytes maintained at 39 degrees C (73.2%) than for oocytes cooled at 20 degrees C (58.6%), 10 degrees C (47.3%), or 0 degree C (36.9%). Cleavage rates were 58.3, 45.3, 15.7 and 7.0% for 39 degrees C, 20 degrees C, 10 degrees C and 0 degree C, respectively (P < 0.05). The lowest development rate to the blastocyst stage was obtained with oocytes cooled to 10 degrees C (0.0%) or 0 degree C (0.9%), followed by 20 degrees C (7.1%) and 39 degrees C (16.5%; P < 0.05). In a second experiment, the zona pellucida was removed after cooling but prior to fertilization (zona-free) from a portion of the in vitro- matured bovine oocytes in each treatment. When sperm penetration rates of zona-free oocytes were compared (percentage of oocytes exhibiting > or = 2 pronuclei), there was no difference (P > 0.05) between oocytes cooled at 0 degree C (59.7%) or 10 degrees C (67.9%). However, penetration rates in these 2 groups were lower (P < 0.05) when compared to zona-free oocytes cooled at 20 degrees C (83.1%) or those maintained at 39 degrees C (83.1%). Zona-free oocytes had higher penetration rates (P < 0.05) when cooled at 0 degree C (59.7%) or 10 degrees C (67.9%) than zona-intact oocytes cooled at 0 degree C (37.3%) or 10 degrees C (47.2%). However, there was no difference in the penetration rate when zona-free and zona-intact oocytes were cooled at 20 degrees C or maintained at 39 degrees C. These data demonstrate that cooling in vitro-matured bovine oocytes decreases the percentage of oocytes that undergo fertilization and subsequently develop in vitro. Moreover, at least part of the decrease in fertilization following oocyte cooling is due to effects on the zona pellucida." @default.
• W2053642870 created "2016-06-24" @default.
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• W2053642870 date "1998-04-01" @default.
• W2053642870 modified "2023-09-30" @default.
• W2053642870 title "Effect of low temperatures on in-vitro matured bovine oocytes" @default.
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• W2053642870 doi "https://doi.org/10.1016/s0093-691x(98)00063-6" @default.
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