A high rate of piglet mortality is a consequence of selecting for sows that have large litters. New research will focus on breeding for survival until weaning and survivability to slaughter.
Source: The Pig Site, January 18, 2023. Link. The negative side effects of sows giving birth to large litters, often with more piglets than productive teats, means that managerial efforts must be increased. Otherwise, the mortality rates remain high as the sow is not capable of rearing all her piglets.