The age of retirement of cows from the herd, depending on genetic and paratypical factors

Abstract. The purpose of the research is to study age retirement cows from herd, depending on various genetic and paratypical factors. Methods. was carried out according data a black-and-white breed dairy herd Chelyabinsk region. studied animals different ages were divided into groups relative live weight at first fruitful insemination, mothers bulls-producers Holstein lines. paper analyzes for period 2003 2019 9247 heads cows. scientific novelty lies in analysis factors affecting increase herd. As result, it found that 3.4 lactation. But only 29.0 % eliminated 5 lactations older. At early stages economic use (before 2nd lactation), rejected due diseases genital organs (1.5 respiratory (1.0–1.25 surgical (1.5–1.8 lactation) limb injuries (1.8 lactation). shortest use, equal 3.5 lactation, observed fruitfully inseminated 18 months older with more than 400 kg. Long-lived (older 7 lactations) weakly transmitted their signs productive longevity daughters, whose 3.57–3.75 daughters line Reflection Sovering 198998 had longer – an average 5.1 lactations. Genetic affect this issue, as well competent application results obtained, make possible production or more.