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Journal of Dairy Science Vol. 47 No. 4 378-381
© 1964 by American Dairy Science Association ®
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Genetic Polymorphism in Caseins of Cows' Milk. II. Confirmation of the Genetic Control of ß-Casein Variation

M. P. Thompson, C. A. Kiddy1, J. O. Johnston1 and R. M. Weinberg

Eastern Regional Research Laboratory, Philadelphia, Pennsylvania

ABSTRACT

Examination of the caseins from 1,349 individual cows of the five major dairy breeds in the United States showed that the A and B alleles of ß-casein occur in Jerseys and Holsteins. The A, B, and C alleles occur in the Guernsey and Brown Swiss breeds. Only the A allele has been found in the Ayrshire breed. These results confirm the discovery' of ß-casein polymorphism by Aschaffenburg (1, 2) and support his conclusion that the variability has a genetic basis.

FOOTNOTES

1 Dairy Cattle Research Branch, Agricultural Research Service, U. S. Department of Agriculture, Beltsville, Maryland.






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Copyright © 1964 by the American Dairy Science Association ®.