allowing reduction of the dose to a quarter of the usual recommendation (Kirkwood et al. 1996; Kaeoket 2006).The use of a single hormone application and reduction
in the number of hormones used in protocols for a single or double FTAI have been considered in some studies, showing effectiveness to synchronize ovulation and reduce the number of inseminations (Martinat-Botteet al. 2010; Knox et al. 2011; Driancourt et al. 2013).This tendency in recent studies will likely facilitate the use of FTAI in the routine of commercial farms due to reduction of costs and labour with hormonal protocols. Information about the possibility of using a single FTAI combined with induced ovulation in spontaneous oestrus is lacking for gilts. This study aimed to evaluate
the effect of different doses and routes of pLH administration at the onset of oestrus, combined with a single FTAI, on the interval between onset of oestrus and ovulation (IOEO) and reproductive performance of
gilts.