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

0–3

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

7–20

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

0–3

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

7–20

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

0–3

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

7–20

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