Zaitsev Y. Selection and genetic evaluation of the formation of a high-yielding herd in an open population of dairy cattle.

The work is about researching the effectiveness of the formation of a highly productive herd of dairy cattle in an open cow population during the long-term use of the gene pool of the Holstein breed. The high level of dairy productivity of the Holstein cows of the German breed of imported and own reproduction, their adaptive capacity and adaptability to the intensive milk production technology was established. A comparative analysis of the characteristics of the animals of two adjacent generations of the Holstein breed of German and Ukrainian breeding revealed a natural increase in the productivity of cows and daughters. The development of traits in the daughters of mothers with different levels of naivda is elucidated. The degree of correlation, regressive dependence and inheritance of economic utility features in animals of adjacent generations of Holstein breed of different breeding is investigated. Determined degree of determinism, informativeness and organization of signs of productivity, reproductive ability and adaptation in cows of related generations. It was established that the development of the signs in the Holstein breed cows depends on the linear membership, parentage and mother's origin. Estimated duration of use and manifestation of lifetime productivity of cows of Holstein breed of German and Ukrainian breeding. The influence of the line on the manifestation of the signs of the duration and lifetime productivity of Holstein breed cows of different breeds was determined. The expediency of using the Holstein breed gene pool for the formation of highly productive herds of dairy cattle is substantiated.