title: [The genetics of cattle leukemia. I. Transmission, age at onset, influence of the size of the population, purity of the breed, and milk production on the development of leukemia].
abstract: The age of leucosis disease of cattle was found to be 6,5 years on the basis of the materials collected on seven State farms. The probability of the disease in young animals was found to be low, and it increased in adult cows. The size of population and the percentage of purebred in herd did not influence on the frequency of the disease. Highly productive animals were mostly exposed to the disease, while healthy and diseased animals exerted no differences in the fat content of milk.
mesh_terms: D000367:Age Factors; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology*; D005260:Female; D006824:Hybridization, Genetic; D007774:Lactation; D007844:Latvia; D007938:Leukemia / Q000453:epidemiology / Q000235:genetics / Q000662:veterinary*; D008297:Male; D011156:Population Density; D011247:Pregnancy
vernacular_title: Nekotorye voprosy genetiki leĭkoza krupnogo rogatogo skota. Soobshchenie I. Rasprostranenie, vozrast zabolevaniia, vliianie razmera populiatsiĭ, chistoporodnosti i molochnoĭ produktivnosti na chastotu vozniknoveniia leĭkoza