title: [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].
abstract: 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.
mesh_terms: D000375:Aging; D000818:Animals; D001947:Breeding; D002417:Cattle / Q000235:genetics*; D005260:Female; D007844:Latvia; D008892:Milk; D009035:Mothers; D012800:Siberia; D014380:Tuberculosis, Bovine / Q000453:epidemiology / Q000235:genetics*
vernacular_title: Genetika ustoĭchivosti krupnogo rogatogo skota k tuberkulezu. Soobshchenie I. Vozrast zabolevaniia, molochnaia produktivnost' i vliianie matereĭ na chastotu porazhennosti potomstva.