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Table 3 Summary of the analysed variables

From: The relationship between antibody status to bovine corona virus and bovine respiratory syncytial virus and disease incidence, reproduction and herd characteristics in dairy herds

 

NEG herds

POS herds

Variable

Median

IQR

Median

IQR

Herd size, cow-years

57

40-75

43

32-62

Milk yield, kg/cow-year

9013

8640-9982

8964

88315-8759

BTMSCC1, 1000 cells/ml

163

140-187

218

164-283

Calving interval, days

390

381-413

402

387-415

Calving to first AI2, days

84

76-98

91

80-104

Number of AI2

1.7

1.5-2.3

1.8

1.6-2

Dead calves3 0-24 h

0.040

0.033-0.052

0.047

0.028-0.093

Culling3

0.26

0.23-0.39

0.36

0.26-0.42

UDS3,4 ≥ 6

1.3

0.97-1.4

1.7

1.2-2.3

  1. Comparison between 10 Swedish dairy herds antibody negative (NEG) to bovine coronavirus (BCV) and bovine respiratory syncytial virus (BRSV) and 69 herds positive (POS) to either BRSV or BCV or both, measured by an ELISA test in pooled milk samples from five home-bred primiparous cows, collected in September-October 2006.
  2. 1 Bulk tank milk somatic cell count, geometric mean of 12 monthly measurements. P < 0.001 estimated in a linear regression model.
  3. 2 AI = artificial insemination
  4. 3 One-year incidence rate
  5. 4 UDS = udder disease score, see main text for explanation.