Table 3 Proportion of cows in the study group and control group treated during lactation or at drying-off (dry cow therapy) or both. Number of treatments per cow during the study year is also shown

Study group

 2010

31.0^a

1.31

9.4^c

6.8^e

2.48

 2011

29.4^a

1.28

9.6^c

6.6^e

2.45

 2012

27.7^a

1.27

9.2^c

5.8^e

2.40

 Average

29.3

1.29

9.4

6.4

2.44

 Total number of treated cows

35,074

11,287

7632

Control group

 2010

6.7^b

1.23

5.2^d

1.0^f

2.35

 2011

5.4^b

1.21

5.1^d

0.7^f

2.32

 2012

4.1^b

1.19

4.6^d

0.6^f

2.31

 Average

5.4

1.21

5.0

0.8

2.33

 Total number of treated cows

28,976

30,762

4105