An interest for genetic aspects of bovine leukemia has been shown by research workers almost as soon as the discovery of this disease was made (1). Research reports in this field were reviewed by E n g e l b r e t h -H o l m (2), W i e s n e r (3) and others. Up to now there have been several viewpoints on the nature of hereditary transmission of resistance to bovine leukemia. Hereditary predisposition to disease is transmitted according to a monogenic mode with three pairs of alleles the susceptibility to different forms is thought to be due to dominant ones (4, 5). According to other investigators the resistance is controlled by a dominant allele at single locus (6). A hypothesis of genetic control was also proposed according to which a provirus occuring in the host genome appears as a dominant factor of disease the action of the provirus becomes apparent in the absence of non-allelic dominant repressor R (7).

L. K Ernst, P. G Klabukov, D. V Karlikov, R. O Grinberg

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2, Madrid, Spain, 187–190, 1974
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