Table 5 Association between parlour and roadway hygiene and bulk tank total bacterial score (TBS)

Cleanliness of the parlour

Clean

43

9.88 (19)

0.033

0.0047

Slightly dirty

48

9.90 (20)

0.031

Dirty

9

10.14 (25)

0.074

Cleanliness of milking unit claw piece

Clean

42

9.83 (19)

0.033

< 0.001

Slightly dirty

45

9.93 (21)

0.032

Dirty

13

10.13 (25)

0.059

Condition of the milking unit liners

New

82

9.90 (20)

0.024

0.1551

Slightly cracked

12

10.03 (23)

0.065

Cracked

7

9.93 (21)

0.086

Collecting yard cleaning frequency

After every milking

17

9.90 (20)

0.053

0.1686

Daily

37

9.85 (19)

0.035

Weekly

15

9.95 (21)

0.056

Every second day

13

10.02 (22)

0.061

Every third day or twice a week

6

9.91 (20)

0.087

Slates

6

9.93 (21)

0.087

As required or other

6

10.04 (23)

0.088

Cleanliness of yard

Clean

26

9.87 (19)

0.045

0.1946

Slightly dirty

43

9.88 (20)

0.035

Dirty

27

9.98 (22)

0.043

Very dirty

4

10.01 (22)

0.115

Cleanliness of road

Clean

25

9.86 (19)

0.044

0.0389

Slightly dirty

51

9.89 (20)

0.030

Dirty

17

9.97 (21)

0.053

Very dirty

7

10.12 (25)

0.087

Condition of road way

Very good

17

9.84 (19)

0.052

0.0399

Good

59

9.90 (20)

0.028

Poor

24

10.00 (22)

0.044