**6. Conclusions**

The process of parturition is long and complicated in the hyperprolific sow. It brings about increased risk of uterine contamination, mammary gland inflammation and retained placenta, therefore increasing post partum inflammation leading up to post partum dysgalactia PDS. From the fetal/neonatal point of view, hypoxia may develop due to the extended expulsion phase of parturition. Moreover, the quality and quantity of colostrum intake goes down when the decreasing window for suckling. In the early lactation, metabolic stress in profound due to the increased demand for energy and nutrients, which worsens the negative energy balance and may affect development of next generation follicle development and thereby future generations of piglets. Environmental and dietary effects on the gut microbiota of sows and piglets have an impact during gestation, farrowing and lactation, possibly improving performances of hyperprolific sows and of piglets in large litters.
