The half-life of bovine immunoglobulins was established in a group of 60 calves suckled on non-infected dams immunised with antigens to Brucella abortus. The half-life of the "incomplete antibody" as determined by the anti-bovine globulin test was 20.9 days. Up to 45 days, the mean half-life of antibodies in the calves was 17.1 days; from 46 to 99 days it was 21.1 days and for periods exceeding 100 days it was 24.4 days. In 39 calves born of and suckled on infected dams the mean half-life of antibodies was 22.4 days. Up to 100 days the figure was 19.5 days; over 100 days it was 22.8 days. There was no significant difference in the mean half-life of antibody between calves from infected and non-infected dams. In both cases the antibodies appear to be catabolised at a progressively slower rate.
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