Crushing of piglets by the mother sow (Sus scrofa) - purely accidental or a poor mother?

By I. Andersen, S. Berg, K. Bøe. 2005

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Non-infectious causes of pre-weaning mortality in piglets (2016, background): “Crates were especially designed for preventing posterior crushing (beneath the sow's hind quarters), although they are not as effective in preventing ventral crushing when lying down from a sitting position (beneath the udder and rib cage) (Andersen et al., 2005; Pedersen et al., 2011; Wischner et a”
Nest-building behaviour in sows and consequences for pig husbandry (2009, background): “Andersen et al. (2005) described significantly more nestbuilding activity of sows in pens that had not crushed one single piglet within the first 4 days.”
Original papers: Modelling and monitoring sows' activity types in farrowing house using acceleration data (2011, methodology): “Other perspectives for application of the method suggested in this article are monitoring i) sows’ health disorders occurring around farrowing; and ii) behaviour of sows at risks for piglet crushing, by monitoring particular activities, especially lying behaviour (Damm et al., 2005; Andersen et al.,”
Parent–offspring resource allocation in domestic pigs (2007, background): “Correspondingly, piglet mortality rates are high: in domestic breeds, an average of 12% of piglets born alive die before weaning (Varley 1995), with greater losses in free-ranging environments (cited in Andersen et al. 2005 ).”