Few studies evaluating protocols for fixed-time artificial insemination (FTAI) in gilts have been performed
(Degenstein et al. 2008; Martinat-Bott e et al. 2010).
The use of a single hormone for FTAI protocols in pubertal gilts can be difficult because they are in different
phases of the oestrous cycle. This is in contrast to scenario of FTAI in weaned sows, for which several hormonal protocols to induce follicle growth and ovulation are available (Cassar et al. 2005; Martinat-Bott e
et al. 2010; Knox et al. 2011; Driancourt et al. 2013).
Protocols proposed for FTAI in gilts involve the use of progesterone (P4) analogue, followed or not by the use of eCG, to stimulate follicle growth, and an ovulation inductor such as GnRH, hCG or porcine luteinizing hormone – pLH (Degenstein et al. 2008; Martinat-Bott e
et al. 2010). According to Degenstein et al. (2008), the use of pLH is more efficient than hCG to induce ovulation after using P4 analogue and eCG in pubertal gilts. Embryo survival has not been impaired in gilts