A total of 29 in SinS, 25 in SinC, 29 in CinS and 27 in CinC embryo transfers were performed, resulting in 25 SinS, 22 SinC, 25 CinS and 24 CinC pregnancies (based on non-return to oestrus of the recipients, as detected by vasectomised rams on Day 11 post embryo transfer). All pregnant ewes from all groups were maintained together under farm commercial conditions.