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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).