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

Table 1 Descriptive statistics for four register-based indicators for discriminating between lameness prevalences ≥ 16% (High, n = 10) and < 16% (Low, n = 30) in 40 Danish dairy herds

	Mean		P-value*	Median	SD	Q1	Q3	Max
Indicator	Low	High		Low/High	Low/High	Low/High	Low/High	Low/High
Cow mortality^a	4.6	7.3	0.04	3.6/5.0	2.9/3.9	0.0/4.9	7.3/9.7	10.2/16.1
Bulk milk SCC^b	204	241	0.05	196/226	49/48	163/213	235/276	327/318
Lean cows^c	24.1	25.5	0.8	24.4/23.9	14.7/15.6	11.9/13.3	33.3/41.3	59.5/43.6
SD age at first calving^d	2.5	2.6	0.6	2.3/2.3	0.7/0.8	2.2/2.2	2.9/2.3	3.9/4.6

*P-values derived from the univariable screening for the differences in means between the two groups of lameness prevalence (high ≥ 16%, low < 16%)
^aAnnual mean cow mortality rate
^bBulkmilk somatic cell count × 1000 cells/mL
^cProportion of lean cows at slaughter out of total number slaughtered per herd (%)
^dStandard deviation (SD) of age at first calving in months

ISSN: 1751-0147