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Table 4 Adjusted odds ratios (OR) and 95% confidence intervals from five risk factor groups

From: Herd specific risk factors for Mycoplasma hyopneumoniae infections in suckling pigs at the age of weaning

Model & variables

Level

Odds ratio

95% CI

p-value

Herd management

    

Exclusive piglet producer without any fattening pigs

Yes

0.90

0.39-2.10

0.81

No

1.00

  

Between 250 and 500 sows per herd

Yes

1.88

0.81-4.33

0.14

No

1.00

  

More than 500 sows per herd

Yes

1.61

0.40-6.59

0.50

No

1.00

  

No batch farrowing or farrowing rhythm not in accordance with the sows’ natural oestrus cycle

Yes

2.67

1.24-5.73

0.01

No

1.00

  

Farrowing

    

Maximum number of farrowing pens per compartment: 8-16

Yes

1.81

0.74-4.42

0.19

No

1.00

  

Maximum number of farrowing pens per compartment: > 16

Yes

3.31

1.69-9.37

0.02

No

1.00

  

Air inlet in the farrowing unit not solely comprised by door inlet

Yes

1.57

0.68-3.63

0.59

No

1.00

  

Air outlet in the farrowing unit not solely comprised by door outlet

Yes

1.79

0.65-4.94

0.26

No

1.00

  

Age of piglets when ear tagging takes place: > 3 and < 7 days

Yes

2.50

0.56-11.27

0.23

No

1.00

  

Age of piglets when ear tagging takes place: > 7 days

Yes

3.74

0.68-16.23

0.08

No

1.00

  

Vaccination of suckling pigs

    

one-shot-vaccine against M. hyopneumoniae

Yes

5.50

1.62-18.65

0.01

No

1.00

  

two-shot-vaccine against M. hyopneumoniae

Yes

4.69

1.31-16.80

0.02

No

1.00

  

Vaccine against PRRSV

Yes

4.39

1.66-11.61

<0.01

No

1.00

  

Replacement policy

    

4 - 7 purchases of gilts per year

Yes

1.40

0.49-3.99

0.53

No

1.00

  

> 8 purchases of gilts per year

Yes

4.28

0.75-24.45

0.10

No

1.00

  

Total number of gilts purchased per year: 80 -119

Yes

1.09

0.38-3.14

0.88

No

1.00

  

Total number of gilts purchased per year: > 120

Yes

5.80

1.68-20.03

0.01

No

1.00

  

Age of gilts, when delivered < 180 days

Yes

1.00

0.99

1.01

No

1.00

  

Vaccination of replacements

    

Vaccination of gilts against PCV2

Yes

3.55

1.31-9.63

0.01

No

1.00

  

Vaccination of replacement boars against M. hyopneumoniae

Yes

1.71

0.48-6.13

0.41

No

1.00

  

Vaccination of replacement boars against PCV2

Yes

2.38

0.62-9.06

0.20

 

No

1.00

  
  1. Results were obtained from independent multivariable logistic regression models.
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Acta Veterinaria Scandinavica

ISSN: 1751-0147