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Table 1 Reproductive performance data prior to and after implementation of vaccination

From: Reproductive performance of pandemic influenza A virus infected sow herds before and after implementation of a vaccine against the influenza A (H1N1)pdm09 virus

 

before vaccination

after vaccination

 

alteration in the farms

parameter

mean

median

mean

median

p-valuea

decrease (%)

stagnation (%)

increase (%)

 

(n = number of farms)

(SD)

(Q25; Q75)

(SD)

(Q25; Q75)

 

(n)

(n)

(n)

p-valueb

return to oestrus rate (%)

13.52

12a

10.18

9.9a

< 0.001

74.8

5.3

19.8

 

(n = 131)

(6.65)

(8.8; 18)

(4.61)

(7; 12)

 

(98)

(7)

(26)

< 0.001

abortion rate (%)

2.31

1.45a

1.42

1a

< 0.001

57

21.5

21.5

 

(n = 93)

(2.52)

(0.8; 3.0)

(1.67)

(0.4; 2.1)

 

(53)

(20)

(20)

< 0.001

stillbirth rate (%)

7.79

7.8a

7.95

8.2a

> 0.05

40

8.0

52

 

(n = 50)

(3.75)

(5.3; 9.8)

(3.44)

(6.8; 9.9)

 

(20)

(4)

(26)

0.376

piglets born alive/litter (n)

13.24a

13.2

13.56a

13.5

0.001

25.9

3.7

70.4

 

(n = 54)

(1.12)

(12.5; 13.6)

(1.17)

(12.8; 14.2)

 

(14)

(2)

(38)

0.001

preweaning mortality (%)

14.34

14.7a

13.59

13.7a

0.023

49.6

16

34.4

 

(n = 125)

(3.5)

(12.5; 16)

(4.0)

(11.6; 16)

 

(62)

(20)

(43)

0.08

piglets weaned/sow/year (n)

26.06a

26.2

27.39a

27.2

< 0.001

18.1

4.8

77.1

 

(n = 105)

(3.03)

(23.8; 28.5)

(3.15)

(25.5; 29.9)

 

(19)

(5)

(81)

< 0.001

  1. acomparison of the parameters before and after immunisation, t-test or Wilcoxon signed-rank test, respectively
  2. bstagnation was not included in the chi-squared test
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Porcine Health Management

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