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Table 3 Cross-classified relative frequency distributions (%) of six weaning-to-first-mating interval (WMI) groups in parity 1 and subsequent paritiesa

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

WMI groups in parity 1 (days)

Weaning-to-first-mating interval in subsequent parities (days)

0–3

4

5

6

7–20

21 or more

Percentages of sows (%)

Parity 2

0–3

21.4

45.5

19.3

2.9

8.1

2.8

4

9.1

60.5

19.3

2.7

6.3

2.1

5

3.9

32.2

48.9

5.6

6.7

2.7

6

3.0

25.8

46.5

11.3

9.5

3.9

7–20

5.1

31.5

36.2

8.4

14.6

4.2

21 or more

4.2

28.6

38.4

8.0

11.5

9.3

Parity 3

0–3

24.0

43.3

17.1

2.9

10.3

2.4

4

12.0

60.4

16.8

2.1

6.7

2.0

5

5.3

38.1

43.7

4.3

6.3

2.3

6

4.2

30.6

44.4

9.2

8.4

3.2

7–20

6.0

33.7

35.9

7.5

13.1

3.8

21 or more

4.9

29.4

36.6

8.6

12.0

8.5

Parity 4

0–3

22.0

46.2

17.7

2.5

9.2

2.4

4

11.7

60.4

17.6

2.2

6.3

1.8

5

6.1

40.2

40.9

4.1

6.3

2.4

6

4.6

32.0

44.9

7.5

8.0

3.0

7–20

7.1

37.9

33.9

6.9

11.0

3.2

21 or more

6.5

35.5

36.0

6.9

9.9

5.2

Parity 5

0–3

23.3

46.0

17.0

2.5

9.1

2.1

4

13.8

59.0

16.3

2.2

6.7

2.0

5

7.5

42.9

37.9

3.8

5.8

2.1

6

5.7

36.9

40.7

7.4

6.6

2.7

7–20

7.7

40.3

33.9

5.5

10.1

2.5

21 or more

7.2

37.2

35.9

6.9

8.3

4.5

Parity 6 or higher

0–3

22.7

46.9

19.0

2.4

7.2

1.8

4

13.4

59.1

18.4

2.0

5.4

1.7

5

7.9

42.9

38.8

3.8

4.9

1.7

6

6.0

35.1

42.7

7.2

6.8

2.2

7–20

8.4

39.1

34.9

5.9

9.4

2.3

21 or more

8.0

37.5

36.2

6.5

8.1

3.7

  1. aFrequency within a row totals 100%