The over representation
of farms in Lower Saxony and especially in Schleswig-
Holstein is due to the higher reported occurrence of
chronic wasting conditions in dairy herds at the time of
sampling. Mean herd size was higher on control farms (K:
145 cows) compared to case farms (F1: 119 cows, F2:
116 cows). Most farms had mainly Holstein Friesians, but
17 farms (3 F1, 6 F2 and 8 K) had mainly Red Holstein or
crossbreeds. Milk yield was higher on control farms
(average: K: 26.0 kg per cow and day, F1: 22.8 kg, F2:
21.7 kg) due to the first eligibility criterion