The gilts were inseminated at 215.8 1.0 days of age,the weight of 160.2 1.1 kg, and 2.1 0.02 oestrous cycles, with no difference (p > 0.05) among groups. There was no effect (p > 0.05) of pLH application on oestrous duration and timing of ovulation in relation to the duration of oestrus (Table 1). The use of 2.5 mg of pLH by the vulvar submucosal route tended (p = 0.06)