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Information × Registration Number 0226U001514, (0124U001738) , R & D reports Title To develop recommendations for the use of selective crossing of the Ukrainian Black-and-White Dairy breed with the Holstein in the conditions of different milk production technologies popup.stage_title Розробити рекомендації щодо використання вбирного схрещування української чорно-рябої молочної породи з голштинською в умовах різних технологій виробництва молока Head Sydorenko Olena V., Кандидат сільськогосподарських наук Registration Date 27-01-2026 Organization Institute of Animal Breeding and Genetics nd. a. M.V.Zubets of National Academy of Agrarian Science of Ukraine popup.description1 To substantiate the further use of the gene pool of the Holstein breed for the improvement of economically useful traits of the Ukrainian Black-and-White Dairy breed under progressive and traditional milk production technology. popup.description2 The study presents the results of comprehensive research on the effects of genotypic and technological factors on growth performance, development, and subsequent milk productivity of heifers and cows of the Ukrainian Black-and-White Dairy breed under traditional and progressive production technologies. Growth performance of heifers showed considerable variability depending on line affiliation, sire heredity, and housing conditions, which was reflected in differences in live weight as well as absolute and average daily gains at different age periods. Under the traditional technology, heifers of most studied lines exhibited higher live weight, particularly after 15 months of age. The influence of line affiliation and paternal heredity on heifer growth intensity was more pronounced under the traditional production system. Significant variation in growth among daughters of different sires was observed, indicating the combined effect of genetic and paratypic factors. The conditional proportion of Holstein blood had a limited effect on growth traits, which was confirmed by one-way analysis of variance. Line affiliation and sire heredity also played a significant role in shaping milk productivity across different lactations, with a stronger genetic effect under the traditional technology. Milk yield increased consistently with advancing age and transition from the first to subsequent lactations. Correlation analysis revealed predominantly weak to moderate positive and negative associations between heifer live weight during the rearing period and milk production traits in the first lactation, indicating that selection based on live weight cannot be recommended as a universal criterion under either production system. Product Description popup.authors Chernyak Natalya Grygorivna Babush Svitlana I. popup.nrat_date 2026-01-27 Close