The technique of sperm sorting has reached a state where typical accuracy of sperm sorting for commercial use is 90% X-sperm [1]. Transferable embryo yield is compromised, with a more discernible reduction in cows than in heifers [3], [4] and [7]. In cows, the embryo yield has approximately halved from that achieved with conventional semen. However, in heifers, this reduction is not as extreme, and reasonable results can be obtained [7]. Authoritative data on pregnancy and calving rate after transfer of embryos produced with sexed semen are scarce. Whether decrease in the number of transferable embryos is the only outcome from the use of sexed semen, or embryo viability after transfer of Day-7 embryos is also affected, has not been determined on a large scale. Thus, the objective of this study was to compare the pregnancy rates after transfers of Day-7 in vivo embryos produced either with conventional or sex-sorted semen from numerous bulls commercially available and extensively used. In addition, calf mortality was studied for the two embryo types.