(Fig. 1).There was no difference among treatments (P > 0.05) inthe interval between oestrus onset and ovulation in thesows scanned at 8-h intervals. Overall, oestrus lengthwas 71.1 ± 1.0 h, with no difference between treatments(P > 0.05). On average, ovulation occurred at 30.4 ± 1.4,