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- W2022691143 abstract "It is generally accepted that culturing embryos in groups or with somatic cells improves both the yield and quality of the blastocysts obtained. The aims of this study were 1) to compare the yield and quality of the embryos obtained after culture in several number conditions and in several culture systems and 2) to assess the effect of co-culture started at various stages of embryo development. Under cell-free culture conditions (modified synthetic oviduct fluid [mSOF] supplemented with 10% fetal calf serum [FCS] 48 h post insemination, the rate of Day 10 blastocysts was lower when embryos were cultured in small groups (1 to 6 per drop) than in large groups (4 versus 23% ; P < 0.01). There was no group effect when embryos were co-cultured either with Buffalo rat liver (BRL) cells in TCM 199, or in a culture system allowing the progressive development of cumulus cells in mSOF, even if co-culture started at 66 or 114 h post insemination. However, embryos cultured singly had lower cell numbers than embryos cultured in large groups when co-culture started at 114 h post insemination. This suggests that 1) somatic cells improve the development of singly cultured bovine embryos up to the blastocyst stage after the 9–16 cell stage; 2) co-culture affects blastocyst cell number of singly cultured embryos by acting roughly between the 5–8 and the 9–16 cell stage; and 3) cooperation between embryos could replace the effect of co-culture either on the yield of blastocysts or on blastocyst cell number. Blastocysts appeared significantly earlier in co-culture with cumulus cells in mSOF than in co-culture with BRL cells in TCM 199 (detection of the blastocysts: 7.3 ± 0.1 d post insemination with cumulus cells versus 8.1 ± 0.1 d with BRL cells; P < 0.001) and had a significant higher number of cells (143 ± 9 versus 85 ± 11; P < 0.001). This system thus seems suitable for the culture of small numbers of embryos resulting from in vitro maturation and fertilization of oocytes from individual donor cows." @default.
- W2022691143 created "2016-06-24" @default.
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- W2022691143 date "1997-06-01" @default.
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- W2022691143 title "Effects of co-culture and embryo number on the in vitro development of bovine embryos" @default.
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- W2022691143 doi "https://doi.org/10.1016/s0093-691x(97)00160-x" @default.
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