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Table 2 Categorical variables and their levels collected from 112 sows

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

Variable

Level

Sows / level

  

(n)

(%)

Parity

1. parity

32

28.6

2. parity

18

16.1

3. parity

11

9.8

4. parity

17

15.2

5. parity

7

6.3

6. parity

6

5.4

7. parity

9

8.0

8. parity

8

7.1

9. parity

4

3.6

Time of farrowing*

day

66

58.9

night

46

41.1

Abnormal behaviour (aggression, etc.)

no

105

93.8

yes

7

6.2

Diseases

no

95

84.8

local diseases**

5

4.5

systemic disease incl. PPDS

12

10.7

Time of occurrence of disease

day of partum

1

5.9

1 day post-partum

8

47.1

2 days post-partum

2

11.8

3 days post-partum

4

23.5

later

2

11.8

Facultative treatment with antibiotics effective against M. hyopneumoniae***

no

94

83.9

yes

18

16.1

Level of antibodies against M. hyopneumoniae ante-partum

S/P ratio < 0,4

25

22.3

 

S/P ratio ≥ 0,4

87

77.7

Level of antibodies against M. hyopneumoniae post-partum

S/P ratio < 0,4

52

46.8

 

S/P ratio ≥ 0,4

59

53.2

  1. *‘day’ linked to working hours, whereas ‘night’ was out of working hours.
  2. **local disease = arthritis, circumscribed dermatitis, shoulder lesion, etc.
  3. ***treatments with amoxicillin, ampicillin, colistin and penicillin were considered being NOT effective against M. hyopneumoniae, whereas apramycin, enrofloxacin, tetracyclin and tulathromycin were taken into account as being effective against M. hyopneumoniae.