Prevalence of Bovine Leukemia Virus Antibodies in US Dairy Cattle

Table 1

Characteristics of enrolled herds from herd records; s.d.: standard deviation; i.q.r.: interquartile range.

		East	Midwest	West	Total
Herd count (n)		37	59	7	103
Herd Size (cows per herd)	Mean (s.d.)	509.7 (509.1)	558.9 (1020.5)	651.3 (496.0)	547.5 (836.3)
	Median (i.q.r.)	221.0 (560.0)	241.0 (586.0)	477.0 (151.0)	267.0 (560.0)
	Range	82 – 1832	59 - 7453	339 - 1764	59 -7453
Proportion Holstein	Mean (s.d.)	0.90 (0.20)	0.96 (0.10)	0.96 (0.50)	0.93 (0.14)
	Median (i.q.r.)	0.98 (0.10)	0.99 (0.03)	0.99 (0.08)	0.99 (0.04)
	Range	0.06 – 1.00	0.37 – 1.00	0.89 -1.00	0.06 -1.00