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Table 1 Twin pregnancy rates and outcomes in rhesus monkeys following the transfer of intact or demi-embryos.

From: Assisted reproductive technologies in rhesus macaques

  Pregnancy rate per transfer (%) Twinning rate per transfer (%) Live birth rate per twin pregnancy (%)
Intract-embryos 14/57 (25) 14/70 (20) 18/28 (64)
Demi-embryos 12/55 (27) 1/12 (8) 0/2 (0)
  1. The pregnancy rate was determined from transfers involving only two embryos. The twinning rate was based on all pregnancies (2 or more embryos/transfer) in the intact embryo group, hence the number of pregnancies is larger.