containing a total of 216 mg FSH, given at 12 h intervals beginning 60 h before CIDR removal; and 200 IU of equine serum gonadotrophin (Pregnecol; Horizon Technology Pty Ltd; NSW, Australia) at the time of CIDR removal. Semen was collected by electroejaculation from two rams per breed, and donor ewes of each breed were randomly inseminated laparoscopically with 0.5 ml of fresh semen of the ram of the same breed, 32 h after CIDR removal.