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Table 3 Descriptive statistics for parity, days in milk (DIM), milk yield (kg/cow/day), milk protein content (%) and milk fat content (%) for D. viviparus positive and negative cows where test-day data was available [two records per cow if faecal examination and test-day data were available in summer and autumn (n = 1532); note that some cows changed infection status]

From: The effect of patent Dictyocaulus viviparus (re)infections on individual milk yield and milk quality in pastured dairy cows and correlation with clinical signs

  D. viviparus-positive cows D. viviparus-negative cows
  Mean SD Range Mean SD Range
Parity 1.3 0.7 1.0–4.0 2.9 1.8 1.0–11.0
DIM 116.1 55.4 19.0–254.0 191.8 119.5 1.0–741.0
Milk yield 19.9 5.5 9.4–34.4 21.4 7.1 2.4–47.6
Milk protein content 3.4 0.3 2.7–4.0 3.5 0.4 2.4–6.3
Milk fat content 4.1 0.5 3.3–5.6 4.2 0.7 2.0–7.2
  1. Abbreviation: SD standard deviation