Genetics of cattle resistance to tuberculosis. I. the age of having the disease, milk productivity and the maternal influence on the incidence of the infection in progeny
Petukhov, V.L.
Genetika 17(6): 1088-1094
1981
ISSN/ISBN: 0016-6758 PMID: 7195860 Document Number: 182629
Studies were conducted on the cattle of Latvian brown and black-and-white breeds. From 2742 animals diagnosed, 22,5% caught tuberculosis. It was determined that milk production, percentage of butter-fat, purebredness and mongrel did not affect the frequency of the disease. The families sensitive (50-63%) and relatively resistant (0--15%) to the disease were found. Analysis of 793 mother-daughter pairs showed that 24,7 and 21,9% of daughters from ill and healthy mothers, respectively, fell ill. It is not possible to determine the genotype on the basis of the data concerning phenotypic resistance -- sensitivity trait. Therefore the mass selection will not be effective; the selection among families should be conducted. The distribution of families concerning the frequency of tuberculosis was normal.