Interaction Effect between Herd and Parity in Integrated Evaluation Model for Litter Size

Genome‐wide association study using a single‐step approach for teat number in Duroc, Landrace and Yorkshire pigs in Korea

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The main economic traits of the swine industry include carcass traits, such as body weight or back fat thickness, reproductive traits, such as litter size or conception rate, and growth traits. Many studies have reported that the genetic heritability of carcass traits is high, whereas that of reproductive traits is low (Kavlak & Uimari, 2019;Ogawa et al, 2019).The number of marketed pigs per sow per year indicates that sow productivity is lower in Korea (approximately 18 heads) than in Denmark (28.5 heads) and the Netherlands (27.8 heads), which are advanced pig farming countries (Park & Na, 2020). One reason for this difference is that, although genetic improvements have been achieved in terms of the litter size, the improvement in the ability of sows was insufficient.

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“…The number of marketed pigs per sow per year indicates that sow productivity is lower in Korea (approximately 18 heads) than in Denmark (28.5 heads) and the Netherlands (27.8 heads), which are advanced pig farming countries (Park & Na, 2020). One reason for this difference is that, although genetic improvements have been achieved in terms of the litter size, the improvement in the ability of sows was insufficient.…”