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Table 4 Results of logistic regression analysis for risk factors for high abortion and insemination index in cows and heifers (77 herds)

From: Association of herd BRSV and BHV-1 seroprevalence with respiratory disease and reproductive performance in adult dairy cattle

  

abortion

insemination index

Risk factor

Herds (n)

OR

p

95% CI

OR

p

95% CI

BHV-1 prevalence in cowsa

       

0

25

1

-

-

1

-

-

1-49%

24

7.3

0.003

2.0; 26.9

5.2

0.01

1.5; 18.4

≥50%

28

4.6

0.022

1.2; 16.7

3.4

0.056

1.0; 12.3

Herd sizeb

       

20-99 cows

25

1

-

-

1

-

-

100-199 cows

17

1.2

0.754

0.3; 5.0

0.8

0.725

0.2; 3.0

200-399 cows

21

1.7

0.447

0.4; 6.5

1.2

0.83

0.3; 4.2

> 400 cows

14

0.3

0.165

0.1; 1.6

0.9

0.944

0.2; 4.2

  

aBHV-1 in cows p = 0.009, the Wald test

aBHV-1 cows p = 0.033, the Wald test

  

bHerd size p = 0.193, the Wald test

bHerd size p = 0.957, the Wald test