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Table 4 Descriptive herd data from 19 Swedish dairy herds with high or low calf mortality risk

From: α-Tocopherol and β-carotene concentrations in feed, colostrum, cow and calf serum in Swedish dairy herds with high or low calf mortality

Variable High mortality (n = 9) Low mortality (n = 10) P valuea
25 pct. Median 75 pct. 25 pct. Median 75 pct.
ECM (kg)/year 2008/09 8475 9516 10,207 9265 10,234 10,409 0.24
Herd sizeb 2006/07 153 184 226 129 134 169 0.071
Herd sizeb 2008/09 154 175 222 141 151 170 0.28
% Herd expansionc − 0.058 − 0.013 0.11 − 0.040 0.074 0.10 0.80
  1. aTested with univariable logistic regression, of associations with type of herd
  2. bCows/year
  3. cCalculated as [(herd size 2008/09 − herd size 2006/07)/Herd size 2008/09]