Genetic parameters and genomic breeding values for digital dermatitis in Holstein Friesian dairy cattle: host susceptibility, infectivity and the basic reproduction ratio

Table 1 Characteristics of the farms enrolled in the study

Farm	Number of cows examined^a	Number of cows genotyped^a	Number of observations^b	Average \( \Delta \varvec{t} \) (days)^c	Number of foot baths^d	Prevalence (SD)^e
Farm	Number of cows examined^a	Number of cows genotyped^a	Number of observations^b	Average \( \Delta \varvec{t} \) (days)^c	Number of foot baths^d	Cow level	Foot level
A	134	116	11	14	7	78.0 (5.4)	69.6 (6.6)
B	105	101	11	14	0	56.3 (7.5)	46.9 (7.9)
C	159	152	11	14	5	49.7 (2.8)	40.2 (1.9)
D	118	116	11	14	7	57.8 (5.0)	49.2 (5.1)
E	102	90	11	13.55	9	62.8 (5.0)	54.6 (5.4)
F	133	112	10	15.56	10	59.2 (10.0)	48.7 (10.4)
G	100	98	11	14	3	65.6 (8.1)	58.2 (7.6)
H	189	180	11	14	7	64.9 (6.2)	56.7 (5.8)
I	104	75	11	14	0	56.4 (5.1)	45.6 (4.9)
J	88	88	11	14	0	65.8 (10.8)	58.1 (10.9)
K	130	116	9	14	13	63.6 (9.6)	52.5 (8.5)
L	151	147	11	13.90	3	70.9 (7.2)	62.0 (7.7)
Total	1513	1401	129	14.07	64	62.6 (7.5)	53.9 (11.0)

^aTotal number of different cows on a farm
^bTotal number farm visits
^cAverage number of days between two scorings (\( \Delta t \))
^dTotal number of footbaths given during the study period
^eAverage percentage of animals and feet scored as infected, standard deviation (SD) in brackets

ISSN: 1297-9686