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Table 1 Production data of 20 herds included in a field study in autumn 2021. These data were retrieved from the Norwegian dairy herd recording system from May 1st 2020 till April 31st 2021

From: Comparison of diagnostic methods for assessment of Ostertagia ostertagi exposure in Norwegian dairy herds

 

Study sample

Norwegian dairy units

Median

Mean

Range

Mean

Herd size (cow years)

34.7

33.4

10.4–87.9

29.4¹

Milk yield (kg ECM/day/cow)

25.9

25.6

17.8–33.2

23.6¹

Days in milk

145

154.2

0–567

N/A

  1. ECM: Energy corrected milk N/A: Not applicable ¹Data gathered from “Statistikksamling fra Husdyrkontrollen og Helsekortordningen. TINE SA” [40]
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Acta Veterinaria Scandinavica

ISSN: 1751-0147