CREATOR OF MODERN SELECTION PROGRESS IN LIVESTOCK OF UKRAINE

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The purpose of the article is to highlight the main milestones of the scientific achievements of the famous scientist in the field of animal husbandry, candidate of biological sciences A. P. Krugliak and his contribution to the development of research in biology and selection of farm animals. Research methods - general scientific (analysis, bibliographic), retrospective and source studies.
 The scientific novelty of the article lies in the presentation of the results of the main scientific works of A. P. Krugliak, which contributed to the development of the theory of biology of reproduction and selection of animals, and their practical application. Among them: -improvement of methods of biotechnology of reproduction of farm animals at the stage of introduction of deep freezing of sperm; -development of methods of creation of domestic specialized dairy breeds of cattle by use of the best world gene pool; -development of methods for effective use of bulls-improvers; -breeding and prospects for improvement of the Ukrainian red-spotted dairy breed of cattle; -development of methods for preserving the gene pool of local and small domestic breeds of farm animals.
 The researcher developed the theory of the mode of use of bulls, developed a method of their effective use, established the minimum allowable criteria for the evaluation of frozen sperm and a method of two-stage thawing. At the initiative and direct leadership of A. P. Kruglyak at the Institute of Animal Breeding and Genetics named after M.V.Zubets NAAS created a state gene pool sperm embryo bank, the operation of which provided accelerated breeding of a number of specialized dairy and beef cattle in Ukraine, and the preservation of the gene local grey Ukrainian and white-headed Ukrainian breeds.
 It is proved that thanks to the creative initiatives of AP Kruglyak laid the foundations for the accelerated formation of breed and genealogical structure, and further improvement of the Ukrainian red-spotted dairy breed, the method of breeding animals along short lines is substantiated. The milk yield of cows for 305 days of the last lactation was 7174 kg and in the best herds – 10.0–11.0 thousand kg. With the direct participation of AP Kruglyak, the work of the best in Europe breeding and technological centre in cattle breeding was built and organized, the functioning of which significantly influenced the improvement of dairy breeds of cattle.