During pregnancy, various factors related to the uterine environment can influence foetal-placental development. Uterine vascular distribution, blood flow in the different regions of the uterus and even fetal location along the uterine horn are some examples of characteristics linked to conceptus survival and growth in hyperprolific species. Gestation in pigs lasts an average of 114 days, which can vary by up to four days depending on genetics, lineage, environment and management. This period is considered critical in pig farming due to its importance in developing individuals capable of achieving maximum productivity during their post-natal life.