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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]