Evaluation of the performance of register data as indicators for dairy herds with high lameness prevalence

Table 2 Comparison of cut-offs used in the dichotomization of indicators of high lameness prevalence in 40 Danish dairy herds

Variables	Cut-off
Variables	Pre-defined	Optimized
Cow mortality^a (%)	5.7	3.6
Bulk milk SCC^b (×1000 cells/mL)	245	214
Lean cows at slaughter^c (%)	40	10
SD age at first calving^d (months)	2.4	2.0

^aCow mortality = annual mean cow mortality rate per 100 cow years
^bBulk milk SCC = annual mean bulk milk somatic cell count based on monthly or bimonthly recordings
^cLean cows = percent of cows with fat score 1 according to the EU Beef Carcase Classification
^dSD age at first calving = annual mean standard deviation

ISSN: 1751-0147