The effect of a control program for enzootic bovine leukosis. Changes in herd prevalence in Denmark, 1969-1978.

Abstract:

:As part of the Danish control program for enzootic bovine leukosis, three hematologic screenings of all cattle herds in Denmark were performed in the period 1969-1978. Herds with multiple cases of persistent lymphocytosis and/or leukotic tumors were classified as "leukosis herds." During nationwide blood testing, 369 leukosis herds were discovered, and an additional 77 herds were found due to follow-up of tumor cases or special testing in connection with movements of cattle in 1969-1978. In the present study, the prevalence of leukosis herds in the three screening rounds is related to geographic area and herd size. By means of a statistical log-linear model, the authors show that prevalence increased proportionally with herd size. The observed number of leukosis herds per 10,000 herds tested declined during the screening program from 105 to 38 in east Denmark and from 12 to 4 in west Denmark.

journal_name

Am J Epidemiol

authors

Gottschau A,Willeberg P,Franti CE,Flensburg JC

doi

10.1093/oxfordjournals.aje.a115505

subject

Has Abstract

pub_date

1990-02-01 00:00:00

pages

356-64

issue

2

eissn

0002-9262

issn

1476-6256

journal_volume

131

pub_type

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