Currently, the three most important non-surgical artificial insemination systems used in pigs are the conventional,
the post-cervical (IUI), and the deep-intrauterine (DIUI) methods. In this study, a new system,
termed double uterine deposition insemination (DUDI), which combines aspects of both IUI and DIUI,
was evaluated. This method used a thinner, shorter and more flexible catheter than those normally used
for DIUI and resulted in the deposition of semen post-cervically, approximately half-way along the uterine
horn, thus potentially by-passing the threat of ‘unilateral’ insemination or pregnancy when using
sperm of low concentration. The experiment was carried out over 8 weeks on a group of 166 sows, which
were divided into seven groups, inseminated with semen of varying concentration, using the conventional
system (control group) or by DUDI.