Table 2.

In vivo development of experimental embryos (with ZP dissected close to the ICM) and control embryos after embryo transfer into the uterus of the recipient females

Group	Experimental group (post-ZP drilling close to the ICM)	Control group
No. of embryos transferred (T)	85	72
No. of implantation sites (IS) (implantation rate IS/T)	64 (75.3%)	52 (72.2%)
No. of developed embryos (L) (pregnancy rate L/IS)	33 (51.6%)	35 (67.3%)
No. of implanted, but arrested in development embryos (D)	31	17
No. of abnormally developed or nondeveloped embryos (T-L)	52	37
D/T ratio	48.4%	32.7%
D/IS ratio	36.4%	23.6%
Total no. of embryos	157