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Table 2 Comparison of the outputs of the model of BVDV spread in a beef cow-calf herd cumulated over the acute (years 1 to 3 after initial introduction) versus the endemic phase (years 6 to 15)

From: Modelling the spread of bovine viral diarrhea virus (BVDV) in a beef cattle herd and its impact on herd productivity

Output definition

Acute phase

Endemic phase

Average probability of virus presence1

0.75-0.76-0.76

0.14-0.17-0.25

Average frequency of herd reinfection1 (yr-1)

0-0.02-0.08

0-0.14-0.38

Median prevT (when the virus is present) (%)

1.3-1.5

0.5-1.0

Median prevP (when the virus is present) (%)

1.4-3.5

0-1.2

Median prevRP (when the virus is present) (%)

2.1-5.5

0-1.3

Median losses/100 bred females

23-37

12-53

Median purchases/100 bred females

13-26

34-125

Median sales of grassers & heifers/100 bred females

-7--2

-1-29

Median sales of fattened females/100 bred females

10-23

23-108

Median weaned calves/100 bred females

-5--2

2-39

  1. Ranges came from variations in herd size, type of initial virus introduction, and external risk of reintroduction.
  2. 1For three levels of K ext  = {0, 0.0025, 0.01} (per day).
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Veterinary Research

ISSN: 1297-9716