The standard for embryo production remains the superovulation procedure
coupled with non-surgical recovery and transfer that was first developed in the
1970s. Reuben Mapletoft from the University of Saskatchewan and Karen
McDermott from the Canadian Embryo Transfer Association maintain records
on the scope of embryo transfer in Canada. For 2005, a total of 46,975
embryos produced by superovulation were transferred. Of these, 39,211 or
83% were transferred to dairy cattle. In contrast, only 142 embryos produced
by in vitro fertilization were recorded as being transferred.