Due
to the advancement
of ovulation, reduction of the hormonal
dose and the ease of application, the vulvar submucosal route
would be the best option for FTAI protocols, but their
negative impact on litter size remains to be elucidated. Taking
into account the good fertility results obtained in IM5FTAI
gilts whose ovulation was not advanced, the possibility of a
single FTAI without any hormonal treatment should be
further investigated, to establish reliable FTAI protocols for
gilts.