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Table 1 Changes in number of milking cows per Danish herd and their individual contribution to the bulk milk

From: Challenges for bovine viral diarrhoea virus antibody detection in bulk milk by antibody enzyme-linked immunosorbent assays due to changes in milk production levels

Parameter

 

2003

  

2010

 
 

80 %

83 %

88 %

80 %

83 %

88 %

a

59 (463)

62 (480)

65 (509)

101 (948)

105 (984)

111 (1043)

b

25 (28)

25 (27)

23 (26)

29 (32)

28 (31)

26 (29)

c

1.70 (0.22)

1.61 (0.21)

1.54 (0.20)

0.99 (0.11)

0.95 (0.10)

0.90 (0.10)

  1. Parameters a, b and c were estimated based on data from the Danish diary industry, assuming that usually 17 % of the cows in a herd are dry and not contributing to the bulk milk. Therefore, usually 83 % of the cows are lactating, 80 % is the minimum and 88 % is the maximum proportion of lactating cows. a) Number of lactating cows/herd/day according to median herd size in 2003 (74 cows) and 2010 (127 cows), b) amount of milk produced (kg) per cow/day and c) daily contribution of a single cow to the bulk milk (in %). The estimates for the largest herds in 2003 (579 cows) and 2010 (1185 cows) are shown in brackets