Vestnik OrelGAU, 4(49), August 2014 UDC 636.2.082.2 THE FEATURES OF SELECTION AND GENETIC PARAMETERS OF THE ECONOMICALLY USEFUL TRAITS OF HIGHLY PRODUCTIVE COWS IN CONNECTION WITH THE TERM OF INDUSTRIAL USE Molchanova N.V., Leading Resercher Seltsov V.I.*, Researcher Filipchenko A.A., Post-graduate student All-Russia Research Institute for Animal Husbandry named after Academy Member L.K. Ernst, Moscow, Russia *E-mail: seltsov.vik@yandex.ru ABSTRACT The impact of industrial use of cows on following genetic parameters: phenotypic variability, correlation, repeatability and heritability of economically useful traits in the high producing dairy cows herd of black-motley breed with the high level of holsteins has been studied. <...> With the increasing the period of use cows up to 7 or more lactations, coefficients of variation of all monitored indicators declined in connection with the removal of cows with extreme indicators of productivity and longevity during first 3-4 lactations. <...> The correlation coefficients of milk yields during the first, highest lactation and in lifetime, regardless of the period of use is closely related to the life-long milk yield, milk yield per day of productive life and milk yield per day of life. <...> The heritability coefficients (h²) of the indicators of longevity with increasing period of use cows up to 5 or more lactations has tended to increase: by the age of first calving from 0.01 to 0.16, by the number of highest lactation from 0.18 to 0.33, by milking days from 0.10 to 0.30, by lifetime milk yields from 0.18 to 0.32, and by days of life from 0.01 up to 0.21. <...> The highest repeatability of indicators of milk yield, milk fat, body weight of cows regardless of the duration of their use was for the adjacent lactations (1 and 2, 2 and 3, 3 and 4, 4 and 5, 5 and 6). <...> With increasing distance of lactations from each other the coefficient of repeatability of these traits is lowered. <...> Efficiency of selection work, the definition of the breeding value of the animals and the establishment of breeding programs depend on the population-genetic parameters. <...> The pace of animal improvement increases if the genetic situation in the herd is regularly taken into account. <...> For developing effective breeding program the following parameters used: variability, heritability, repeatability and interdependence of indicators. <...> The variability of trait is determining the genetic shift of sampled trait in the herd. <...> Small degree of variation and overly <...>