Reference period

Observation period

Standard error

p-value

cov

herd

period

Primiparous

AIf

45%

42%

1.1%

0.862

0.519

0.772

AI1f

48%

40%

1.1%

0.958

0.166

0.741

AI3

20%

18%

1.1%

0.243

0.119

0.446

nAI*

2.4

2.5

0.20

0.615

0.85

0.789

Calving to AIf (d)

130.4

133.9

3.02

0.000

0.011

0.441

Multiparous

AIf

34%

38%

1.0%

0.333

0.112

0.014

AI1f

31%

36%

1.1%

0.084

0.107

0.011

AI3

25%

23%

1.1%

0.514

0.038

0.389

nAI*

3.1

2.7

0.14

0.487

0.097

0.007

Calving to AIf (d)

148.8

143.9

3.64

0.003

0.011

0.323