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The J Substance of Cattle

III. Seasonal Variation of the Naturally Occurring Isoantibodies for the J Substance¹

From the University of Wisconsin, Madison, Wisconsin

Abstract

1. Studies of the titers of naturally occurring anti-J sera in two groups of cows, one consisting of 8 and the other of 23 animals, have shown that the concentration of anti-J varies considerably among individuals and for the same individual from one time to another.

2. The rise and fall of anti-J levels among the first group of individuals studied during a 28-month period and among the second group studied during a 19-month period was correlated with the season of the year.

3. In both groups of animals, the highest titers were found during the late summer and early autumn (August to October), and the lowest titers were found during the late autumn and winter (December to March).

4. The physiologic basis for this striking seasonal variation is unknown at present.

Footnotes

¹ From the Departments of Genetics (paper 633) and Veterinary Science, Agricultural Experiment Station, University of Wisconsin, in cooperation with the Agricultural Research Service, U. S. Department of Agriculture. Published with the approval of the Director of the Station. This project was supported in part by the Research Committee of the Graduate School from funds supplied by the Wisconsin Alumni Research Foundation, and in part by a research grant (C-3884) from the Department of Health, Education and Welfare, of the National Institutes of Health, U. S. Public Health Service.

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