Table 4 Factors associated BoHV1 status of stock bulls, using logistic regression analysis. Independent variables including age of individual bulls, movements pre-sampling, herd of origin, and vasectomy

BoHV-1 classification

Age of the bulls

POSITIVE vs. NEGATIVE

2 years vs. 1 year

5.15

1.89

14.03

0.001

3 years vs. 1 year

12.78

4.46

36.61

0

4 years or older vs. 1 year

28.94

9.35

89.5

0

Movement pre-sampling vs. no movement

1.32

1.04

1.67

0.019

Purchased vs. Homebred

3.08

1.51

6.29

0.002

Non vasectomized vs. vasectomized^a

3.16

0.89

11.20

0.074