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Table 3 Comparisons of pre-weaning piglet mortality risk for sows (probabilities of a sow having a piglet death) during early (0–1 days), mid- (2–8 days) and late (9–28 days) lactation between parity, farrowing season, piglets born alive, gestation length and stillborn piglets groups1

From: Five risk factors and their interactions of probability for a sow in breeding herds having a piglet death during days 0–1, 2–8 and 9–28 days of lactation

Groups N Pre-weaning piglet mortality risk
Early lactation Mid-lactation Late lactation
Mean (± SE) Mean (± SE) Mean (± SE)
Parity
 1 55,635 34.3 (1.60)b 25.5 (2.53)a 14.5 (1.91)a
 2–4 123,314 35.4 (1.72)ab 25.7 (2.34)a 12.7 (1.74)b
 5 or higher 85,384 36.4 (1.74)a 21.3 (2.20)b 10.3 (1.45)c
Farrowing season
 Jan.–Mar 64,584 35.5 (1.97) ab 22.3 (2.36)b 12.1 (1.72)
 Apr.–Jun 64,264 35.2 (1.58) ab 24.0 (2.40)ab 12.4 (1.71)
 Jul.–Sept 68,990 34.0 (1.54) b 25.5 (2.40)a 13.3 (1.84)
 Oct.–Dec 66,495 36.8 (1.88) a 24.7 (2.32)a 11.9 (1.54)
Piglets born alive
 11 or less pigs 69,232 28.1 (1.52)c 21.5 (2.14)c 12.2 (1.65)
 12–15 pigs 95,371 35.0 (1.61)b 23.6 (2.21)b 12.3 (1.63)
 16 or more pigs 99,730 43.9 (1.92)a 27.5 (2.80)a 12.8 (1.71)
Stillborn piglets
 0 pigs 127,524 31.5 (1.48)d 22.0 (2.09)d 12.0 (1.59)b
 1 pig 65,185 33.0 (1.62)c 22.8 (2.20)c 11.9 (1.60)b
 2 pigs 38,494 37.2 (1.73)b 24.5 (2.36)b 12.9 (1.71)a
 3 or more pigs 33,130 39.8 (1.98)a 27.2 (2.60)a 12.9 (1.74)a
Gestation length, days
 110–113 days 37,877 39.3 (1.93)a 28.2 (2.63)a 13.4 (1.81)a
 114–116 days 187,339 35.2 (1.68)b 23.1 (2.24)b 12.0 (1.61)b
 117–120 days 39,117 31.8 (1.49)c 21.4 (2.06)c 11.9 (1.57)b
  1. 1Means and SEs were estimated in mixed-effects models
  2. ac Different superscripts within a column represent significant differences in means (P < 0.05)