Are there specific birthing difficulties typically associated with older and overfed sows?

Hogs, Pigs, and Pork February 25, 2011|Print
Prolonged labor, especially that which is associated with difficult birth, and litters produced by large, older sows, are often accompanied by increased numbers of stillbirths and added death losses in the first few days after farrowing. Sows that have been overfed during gestation are more subject to prolonged labor, and some individuals seem to be genetically prone to this problem. Proper feeding can prevent overweight, or thin sows and selection and culling may eliminate animals that are prone to difficult births.