Sow longevity plays a major role in the long-term sustainability and profitability of swine production systems. The number and viability of piglets produced during a sow’s productive life is directly related to the number of pigs available on farms to produce pork and to the length of the sow’s productive life and reproductive efficiency. From an economic perspective, a sow must remain in the herd for at least three-to-four parities to produce enough piglets to reach a positive net return and pay for its rearing costs (Stalder et al., 2003; Lacy and Stalder, 2004). Sow longevity indirectly affects performance of her progeny. For example, mortality rates are higher for gilt progeny when compared to sow progeny. Daily weight gain in gilt progeny is also lower than that observed in progeny of older sows (Carney-Hinkle et al., 2013; Craig et al., 2019; Wijesiriwardana et al., 2022). Early replacements of sows attributed to death have also had a great impact in the destabilization of the immune status of the farm (Niemi et al., 2017). Reduced longevity and involuntary culling have ethical and animal welfare implications. For instance, recent data from North America has reported an increase in sow mortality from 8% in 2012 to nearly 14% in 2021 (Eckberg, 2022). Another study evaluating sow mortality in midwestern USA reported that sow death occurred at a median of parity two and the main reasons for death were locomotion (27%) and reproduction (24%) (Kikuti et al., 2023). In this context, there is an urgent need for developing efficient management and breeding strategies to minimize involuntary culling of sows and improve sow longevity in commercial herds.

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Advances in the genetic improvement of sow longevity

  • Luiz Brito,
  • Susanne Hermesch

摘要

Sow longevity plays a major role in the long-term sustainability and profitability of swine production systems. The number and viability of piglets produced during a sow’s productive life is directly related to the number of pigs available on farms to produce pork and to the length of the sow’s productive life and reproductive efficiency. From an economic perspective, a sow must remain in the herd for at least three-to-four parities to produce enough piglets to reach a positive net return and pay for its rearing costs (Stalder et al., 2003; Lacy and Stalder, 2004). Sow longevity indirectly affects performance of her progeny. For example, mortality rates are higher for gilt progeny when compared to sow progeny. Daily weight gain in gilt progeny is also lower than that observed in progeny of older sows (Carney-Hinkle et al., 2013; Craig et al., 2019; Wijesiriwardana et al., 2022). Early replacements of sows attributed to death have also had a great impact in the destabilization of the immune status of the farm (Niemi et al., 2017). Reduced longevity and involuntary culling have ethical and animal welfare implications. For instance, recent data from North America has reported an increase in sow mortality from 8% in 2012 to nearly 14% in 2021 (Eckberg, 2022). Another study evaluating sow mortality in midwestern USA reported that sow death occurred at a median of parity two and the main reasons for death were locomotion (27%) and reproduction (24%) (Kikuti et al., 2023). In this context, there is an urgent need for developing efficient management and breeding strategies to minimize involuntary culling of sows and improve sow longevity in commercial herds.