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Table 1 Distribution of housing conditions in 559 Norwegian dairy herds by DD category (DD+/DD−) stratified on housing system

From: A case–control study regarding factors associated with digital dermatitis in Norwegian dairy herds

Housing

Free stalls

Tie stalls

DD+ (n = 108)

DD− (n = 281)

DD+ (n = 5)

DD − (n = 165)

n (%)b

n (%)b

n (%)b

n (%)b

Herd sizea

 11.7–30.3

8 (7.4)

69 (24.5)

2 (40.0)

146 (88.5)

 30.4–39.8

18 (16.7)

60 (21.4)

2 (40.0)

14 (8.5)

 39.9–46.9

24 (22.2)

54 (19.2)

1 (20)

3 (4.6)

 47.0–56.4

25 (23.1)

53 (18.9)

0

2 (1.2)

 56.5 or more

33 (30.6)

45 (16.0)

0

0

 Missing

0

0

0

0

Alley-flooring

 Solid concrete

22 (20.4)

39 (13.9)

  

 Slatted concrete

52 (48.1)

170 (60.7)

  

 Solid rubber

20 (18.5)

34 (12.1)

  

 Slatted rubber

6 (5.6)

19 (6.8)

  

 Mixed concrete /rubber

8 (7.4)

17 (6.1)

  

 Other flooring

0

1 (0.4)

  

 Missing

0

1

  

Bedding in cubicles/tie stalls

 Rubber mats

61 (57.0)

186 (66.4)

4 (80.0)

161 (98.2)

 Mattresses

39 (36.5)

77 (27.5)

1 (20.0)

2 (1.2)

 Rubber mats and mattresses

7 (6.5)

14 (5.0)

0

0

 Other bedding

0

3 (1.1)

0

1 (0.6)

 Missing

1

1

0

1

Milking systema

 AMS

96 (88.9)

222 (79.0)

1 (20.0)

0

 Milking parlour

12 (11.1)

57 (20.3)

0

0

 Pipeline

0

2 (0.7)

4 (80.0)

165 (100)

 Missing

0

0

0

0

Milk yield Kga

 4872.3–7863.5

20 (18.5)

57 (20.3)

3 (60.0)

98 (59.5)

 7863.6–8403.9

13 (12.0)

65 (23.2)

0

36 (21.8)

 8404–8912.5

29 (26.9)

49 (17.4)

1 (20.0)

22 (13.3)

 8912.6–9534.1

24 (22.2)

54 (19.2)

1 (20.0)

5 (3.0)

  > 9534.2

22 (20.4)

56 (19.9)

0

4 (2.4)

 Missing

0

0

0

0

  1. aData from NDHRS
  2. bMissing not included in %