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Table 6 Factors associated with dairy herd status for BVD and BoHV1 using logistic regression analysis. Dependent variables included BVD herd status, BoHV-1 herd status, and evidence of recent viral circulation

From: Prevalence of BoHV-1 seropositive and BVD virus positive bulls on Irish dairy farms and associations between bull purchase and herd status

Dependent variable Independent variable Odds ratio Confidence interval (95 %) P value
BVD herd status Purchased bulls in the herd vs. all homebred 3.45 1.2 9.9 0.02
POSITIVE vs. NEGATIVE Region 2 vs. Region 1 4.61 1.74 12.17 0.002
  66–99 cows vs. 31–65 cows 4.06 1.15 14.34 0.029
  Vaccinated vs. no vaccinated 8.78 3.13 24.62 0
  Recent circulation viral vs. no recent circulation 16.55 3.31 82.68 0.001
  Vasectomized bulls in the herd vs. no vasectomized bullsa 3.77 0.93 15.31 0.064
IBR herd status >1 bull vs. 1 bull 2.13 1.08 4.19 0.027
POSITIVE vs. NEGATIVE Region 1 vs. Region 2b 1.86 0.96 3.62 0.064
IBR recent circulation viral Region 1 vs. Region 2 2.8 1.11 7.01 0.028
Yes vs. No >99 cows vs. 31–65 cows 6.71 1.44 31.03 0.015
  Purchased bulls in the herd vs. all homebred 3.9 1.07 14.22 0.039
IBR overall Bull status >1 bull vs. 1 bullc 1.83 0.95 3.54 0.068
Positive vs. negative Purchased bulls in the herd vs. all homebred 2.73 1.28 5.82 0.009
  >99 cows vs. 31–65 cows 1.80 1.19 2.75 0.005
  1. a,b,cIncluded for the purposes of highlighting a trend