in the model.The frequency distribution of IOEO (cumulative and at each time point of evaluation), pregnancy rate and adjusted farrowing rate (AFR) were
analysed through logistic regression using the GLIMMIX procedure. For AFR calculation, dead gilts and those culled for non-reproductive reasons were
excluded. The effects of treatment, number of oestrous cycles (2 and 3), age of semen (≤24 and >24 h) and boars were included as class variables in these models. Total born piglets was analysed using the MIXED procedure,with inclusion of the fixed effects of treatment, number of oestrous cycles, boars and age of semen, whereas the trio of gilts was included as a random effect.