Duration and efficiency of lifetime use of cows of different genotypes according to beta-casein

The article examines the peculiarities of duration and efficiency use cows depending on genotype for beta-casein gene. Genotyping 136 Sumy intrabreed type Ukrainian black white dairy breed brown breed, which are kept in breeding farms State Enterprise «Research Farm Institute Agriculture Northern East NAAS» district region, was carried out. In order to determine polymorphism gene, genetic studies were out laboratory Physiology n.a. Bogomolets NAS with help molecular biological analysis allele recognition by polymerase chain reaction (PCR) real time. determined generally accepted methods, using electronic database SUMS «Orsek» farms. An interbreed differentiation according share abandoned animals established. Among genotyped - 37 % eliminated, 46 breed. Most that eliminated among A2A2 (47 %), A1A1 (67 %). Cows A1A2 had a longer average period life, economic lactation compared other genotypes. terms lifetime productivity, prevailed. values milk yield per day higher genotype. At same time, difference not statistically significant. On contrary, lactation. They prevailed indicators genotypes, insignificant difference. Accordingly, formation herd will allow preserve lifelong cows. obtained results preliminary, is due small number experimental livestock. Therefore, we believe research should be continued. Key words: genotype, beta-casein, life expectancy, coefficient use.