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Table 7 Comparisons of culling risks (%) for farrowed sows between either herd groups or stillborn piglet groups, and the relative risk ratios for culling at different parities estimated by the modelsd

From: Culling in served females and farrowed sows at consecutive parities in Spanish pig herds

 

Parity 1

Parity 2

Parity 3

Parity 4

Parity 5

Parity 6

Final model No.

Model 12

Model 8

Model 5

Model 8

Model 7

Model 7

Groups

Culling risks (± SE)

Herd groups

      

 High-performing herds

5.1 (0.53)a

7.0 (0.68)a

8.8 (0.94)a

12.4 (1.28)a

20.9 (2.78)a

 Ordinary herds

3.6 (0.27)b

4.5 (0.31)b

6.2 (0.43)b

9.5 (0.63)b

15.3 (1.23)b

Pigs born alive groups

      

 16 or more

4.3 (0.44)b

2.5 (0.24)c

3.1 (0.26)c

4.4 (0.34)c

6.5 (0.51)c

11.4 (0.99)c

 9–15

4.3 (0.23)b

3.3 (0.21)b

4.3 (0.25)b

5.6 (0.36)b

8.6 (0.53)b

16.2 (1.25)b

 8 or fewer

7.1 (0.40)a

9.4 (0.62)a

13.1 (0.82)a

16.2 (1.09)a

23.0 (1.46)a

31.1 (2.42)a

Stillborn piglet groups

      

 0

4.3 (0.24)b

3.3 (0.22)c

4.6 (0.28)b

6.0 (0.40)c

9.2 (0.60)b

16.7 (1.32)b

 1–2

4.7 (0.29)b

3.9 (0.27)b

5.0 (0.32)b

6.9 (0.46)b

9.9 (0.65)b

17.6 (1.39)b

 3 or more

6.5 (0.62)a

6.1 (0.49)a

7.7 (0.54)a

9.7 (0.68)a

14.0 (1.02)a

19.4 (1.63)a

  1. SE standard error
  2. a-cMean values within a column followed by different letters differ (P < 0.05)
  3. dRelative risk ratios were not shown because there were two-way interactions in all parities