Age at first calving

101

0.33

0.16

2.01

0.05

0.00

0.65

Days at grass

101

−1.75

0.27

−6.39

<0.0001

−2.29

−1.20

Breed

Baseline

40

Holstein

Holstein Friesian

29

−11.07

20.93

−0.53

0.599

−52.75

30.62

Holstein x

13

35.77

28.14

1.27

0.208

−20.27

91.81

Friesian x

4

−62.68

50.48

−1.24

0.218

−163.19

37.84

Other purebreds

9

−39.32

38.09

−1.03

0.305

−115.17

36.53

Jersey

6

−92.81

38.34

−2.42

0.018

−169.15

−16.47

Calving pattern

Baseline

73

All year round

Autumn

14

−93.18

29.99

−3.11

0.003

−152.91

−33.45

Multi block

10

−23.35

31.37

−0.74

0.459

−85.81

39.11

Spring

5

−75.42

45.31

−1.66

0.100

−165.64

14.79

Herd size

Baseline

12

0 to 99 cows

100 to 199

39

−96.14

29.32

−3.28

0.002

−154.53

−37.76

200 to 299

30

−108.30

32.94

−3.29

0.002

−173.89

−42.71

300 to 399

14

−141.55

36.20

−3.91

<0.0001

−213.63

−69.47

≥400

6

−157.01

46.01

−3.41

0.001

−248.62

−65.39

Region

Baseline

5

East

Far West

8

75.68

51.11

1.48

0.143

−26.08

177.45

Mid West

8

0.94

52.02

0.79

0.434

−62.65

144.52

Midlands

12

−4.01

47.80

−0.08

0.933

−99.20

91.18

North

14

−4.46

45.31

−0.10

0.922

−94.68

85.77

North West

17

72.37

45.93

1.58

0.119

−19.08

163.82

Scotland

10

−7.63

51.83

−1.15

0.883

−110.82

95.57

South

4

62.55

58.98

1.06

0.292

−54.89

179.99

South East

7

−36.72

51.44

−0.71

0.477

−139.16

65.71

Wales

16

36.86

47.63

0.78

0.440

−57.89

131.80