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Information × Registration Number 0226U001838, (0121U108809) , R & D reports Title To study the variation of signs of phenotype expression of the dairy cattle and to develop ways to increase its productivity popup.stage_title Дослідити мінливість ознак прояву фенотипу молочної худоби та розробити шляхи підвищення її продуктивності Head Fedorovych Yelyzaveta І., Доктор сільськогосподарських наук Registration Date 02-02-2026 Organization Institute of Animal Biology of the National Academy of Agrarian Sciences of Ukraine popup.description1 To study the effectiveness of milk productivity assessment of cows with different expression of phenotype signs and to develop ways to increase their genetic potential popup.description2 It was established that cows of the Ukrainian Black-and-White dairy breed are characterized by high indicators of growth, development, and milk productivity, which indicates a considerable genetic potential and adequate feeding and housing conditions. The formation of live body weight, reproductive performance, and milk productivity was influenced to a certain extent by genetic factors, with the highest values observed in the offspring of high-producing sires and representatives of the Elevation line. Optimal combinations of genotypes and the selection of animals from different lines ensured an increase in milk yield and an improvement in milk quality. It was determined that within-line breeding contributed to the stability of economically useful traits, whereas interline crossing promoted an increase in the intensity of live weight gain and productivity. The highest milk yields were obtained from cows with a Holstein inheritance level exceeding 93.75%, whereas animals with a lower proportion of Holstein blood were characterized by a higher milk fat content. It was established that the determining factor in the formation of milk productivity in cows is the sire, whose contribution to milk yield amounted to 24.6–31.8% and to milk fat yield 25.4–29.6% (P<0.001). A significant effect on productivity traits was also exerted by line affiliation, the country of origin of the sires, the method of parental mating, and the breeding method of the cows. Among the ancestors, the most substantial influence on milk yield and milk fat content was exerted by paternal granddams, sires, and paternal grandsires—up to 30.9%. The economic efficiency of the applied breeding decisions was confirmed: the farm obtained a net profit of UAH 36,401.97 with a profitability level of 39.3%. The highest additional profit (UAH 31,465.95) was ensured by the daughters of the sire Detective, and among the lines—H.H. Starbuck under within-line breeding Product Description popup.authors Markian I. Kuziv Vasil B. Todoriuk Taras V. Chokan Nataliia M. Kuziv Mariia S. Stetsyshyn popup.nrat_date 2026-02-02 Close