FIELD: animal breeding, veterinary services, and environment control. SUBSTANCE: proposed method includes estimation of horned-cattle leukemia sickness rate and in addition calculation of leukosis-rate coefficient by finding ratio of species sickness rate to rate of horned cattle infection by leukosis virus in percent or unity fractions, increase in this value pointing to increase in radiation pollution level on territory. EFFECT: provision for another way of estimating impact of radiation pollution on horned cattle population. 3 tbl
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