Sows can be bred by mating with a boar, traditional artificial insemination, or, more recently, post-cervical artificial insemination. Mating with a boar differs from artificial insemination because the boar has a higher number of sperm per ejaculate than an AI dose, and because it is a three phase ejaculate: the pre sperm flush, sperm rich fraction, and post-sperm rich fraction. The three sections work with the sow’s uterine contractions to deliver sperm to the egg. Traditional AI does not insert as far into the cervix as a boar, contains fewer sperm per dose, and is a homogenous mixture. Semen loss is also increased because of the lack of plug that a boar’s post-semen rich faction creates. Post-cervical AI delivers sperm to the uterine body reducing the distance and sperm loss, and it is less time consuming that traditional AI. However, it generally cannot be used on gilts. The reproductive performance of traditional and post-cervical AI is similar, but PCAI achieved this with fewer sperm per dose.