THE FEATURES OF SELECTION AND GENETIC PARAMETERS OF THE ECONOMICALLY USEFUL TRAITS OF HIGHLY PRODUCTIVE COWS IN CONNECTION WITH THE TERM OF INDUSTRIAL USE

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STUDYING OF A NITROGEN-FIXING AND PRODUCTIONAL ABILITY OF DIFFERENT VARIETIES OF SOYA BEAN, USE OF BIOLOGICAL FACTORS IN INCREASING EFFICIENCY OF RESOURCE CONSERVATION AND CROP PRODUCTION STABILITY, ...

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 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. <...> Efficiency of selection determined by the value of variability. <...> The variability of trait is determining the genetic shift of sampled trait in the herd. <...> Small degree of variation and overly big in any herd is undesirable, since the first leads to the fact that cannot be found in a herd of cows for its further improvement on one or another trait, and the second degree can lead to the large value of the regression, that is, return to the average indicators of herd in the offspring of animals. <...> Heritability coefficient reflects <...>

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