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Table 7 Effect of SCNT embryo selection on the cloning outcome

From: Factors influencing the efficiency of generating genetically engineered pigs by nuclear transfer: multi-factorial analysis of a large data set

Selection timing1 Chance for pregnancy Chance for delivery Cloning efficiency (%) No. of live cloned piglets No. of healthy cloned piglets
No selection 1.1 1.9 4.5 3.4 1.4
Selection for 1 day 0.9 - 4.9 4.3 1.5
Selection for 2 days 0.6 4.0 6.8* 3.2 2.0
Mixed selection 1.8 4.0 3.5 2.6 1.3
  1. No selection was used as the reference category. For details on the statistical analysis and definition of the cloning benchmarks listed, please see Methods.
  2. * Statistically significant differences (p < 0.05).
  3. 1 No selection: all SCNT embryos transferred; selection for 1 day: 1-cell stage SCNT embryos transferred; selection for 2 days: 2-cell to 4-cell stage SCNT embryos transferred; mixed selection: mixed SCNT embryos transferred (no selection/1 day and 1 day/2 days)