Abstract
Genetic selection has resulted in a considerable increase in litter size, paralleled by an increase in farrowing duration and perinatal mortality. This paper describes some of the physiological changes around farrowing, and how genetic trends and sow management interact with these. Compromised farrowing can be related to nutritional management, or to housing conditions and handling of periparturient sows. Transition diets for example, can be formulated to support calcium homeostasis and alleviate constipation. The opportunity to expression natural behaviours and minimising stress around farrowing can further optimise farrowing conditions and reduce piglet mortality. Loose farrowing systems are part of the answer to the challenges around farrowing, however, current systems do not perform consistently. In conclusion, increased farrowing duration and increased perinatal mortality may to some extent be inevitably related to trends in pig production, however, they can be improved by nutritional measures, housing conditions and farrowing management.
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