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Table 5 Comparisons of farrowing rates, subsequent piglets born alive and subsequent weaning-to-first-mating interval (WMI) of six WMI groups in consecutive served parities1

From: Recurrence patterns and lifetime performance of parity 1 sows in breeding herds with different weaning-to-first-mating intervals

Served parities
WMI groups in parity 1 (days) n 2 1 2 3 4 5 or higher
   Mean (± SE)   
Farrowing rates, %
03 5909 82.8 (0.65)c,y 87.2 (0.52)ab,wx 87.6 (0.59)ab,w 87.8 (0.57)ab,w 85.1 (0.53)bc,xy
4 43,178 88.0 (0.31)a,w 88.1 (0.32)a,w 88.8 (0.31)a,w 88.0 (0.33)a,w 86.5 (0.33)ab,x
5 55,378 87.0 (0.33)b,y 88.1 (0.31)a,w 88.4 (0.30)ab,w 87.6 (0.33)ab,x 87.2 (0.31)a,xy
6 11,377 82.4 (0.53)c,x 88.6 (0.43)a,w 88.6 (0.44)a,w 87.9 (0.33)ab,w 87.3 (0.40)a,w
720 18,219 81.2 (0.50)c,x 86.9 (0.41)b,w 86.5 (0.43)b,w 86.4 (0.41)b,w 86.0 (0.39)ab,w
21 or more 9991 81.1 (0.57)c,x 85.5 (0.52)b,w 84.5 (0.56)b,w 85.8 (0.58)b,w 84.6 (0.51)c,w
Subsequent piglets born alive
03 5590 12.2 (0.081)b,x 12.7 (0.082)w 12.9 (0.084)w 12.5 (0.085)x 12.0 (0.081)y
4 41,288 12.2 (0.070)b,y 12.8 (0.071)w 12.8 (0.070)w 12.6 (0.071)x 12.1 (0.070)z
5 52,657 12.0 (0.070)c,y 12.7 (0.070)w 12.8 (0.070)w 12.6 (0.070)x 12.1 (0.070)y
6 10,672 11.8 (0.075)d,z 12.6 (0.076)wx 12.8 (0.070)w 12.5 (0.078)x 12.2 (0.075)y
720 16,885 12.1 (0.073)bc,x 12.6 (0.074)w 12.7 (0.074)w 12.6 (0.075)w 12.1 (0.073)x
21 or more 9084 12.7 (0.077)a,w 12.7 (0.077)w 12.7 (0.079)w 12.5 (0.081)x 12.0 (0.078)y
Subsequent weaning-to-first-mating interval, days
03 5317 5.6 (0.09)d,w 5.7 (0.09)de,w 5.5 (0.10)d,w 5.4 (0.10)c,wx 5.2 (0.09)c,x
4 39,517 5.5 (0.06)d,w 5.5 (0.06)e,w 5.4 (0.06)d,w 5.4 (0.07)c,w 5.2 (0.06)c,x
5 50,040 5.9 (0.06)c,w 5.7 (0.06)de,x 5.6 (0.06)cd,x 5.5 (0.06)c,y 5.2 (0.06)c,z
6 10,048 6.4 (0.08)b,w 6.0 (0.08)c,x 5.9 (0.08)bc,xy 5.7 (0.08)bc,y 5.4 (0.08)bc,y
720 15,940 6.6 (0.07)b,w 6.5 (0.07)b,w 6.1 (0.07)b,x 5.8 (0.08)ab,xy 5.6 (0.07)ab,y
21 or more 8251 7.8 (0.08)a,w 7.6 (0.08)a,w 6.5 (0.09)a,x 6.1 (0.09)a,y 5.8 (0.09)a,y
  1. 1Means and SE were estimated by using mixed models
  2. 2n represents initial number of sows
  3. a-eDifferent superscripts within a column represent significant differences in means (P <  0.05)
  4. w-zDifferent superscripts within a row represent significant differences in means (P <  0.05)