The incidence of Brucella abortus, Leptospira pomona, and Vibrio fetus antibodies in beef cattle in the Gisborne district

Abstract

Extract

Following the use of pregnancy diagnosis as an aid to farming beef cattle herds as described by McFarlane (1955), it became apparent that many cows already inoculated with Strain 19 were aborting after pregnancy diagnosis. These abortions occurred only on a small proportion of the properties, so that it was unreasonable to assume that they were in any way associated with the physical interference at pregnancy diagnosis.