T. V. Zaznobina, L. V. Efimova
Krasnoyarsk Agricultural Research Institute – the separate division of the Krasnoyarsk Science Centre of the Siberian Branch of Russian Academy of Science, Krasnoyarsk, Russia
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Volume 26 No. 1
Date of paper submission: 15.08.2025, date of review: 25.09.2025, date of acceptance: 07.11.2025.
Published: 01/30/2026
Abstract. Cow milk is an important human food product; it must be of high quality and biologically safe. Particular attention is paid to one of the most important milk quality indicators – the somatic cell count (SCC). The purpose of this research was to determine the influence of the “line” and “sire” factors on the quantitative and qualitative indicators of Holstein cow’s milk. Scientific novelty. For the first time in the Krasnoyarsk Territory, the influence of line and paternal heredity on milk productivity and the somatic cell count in the milk of Holstein cows was established. Methods. Scientific research was conducted in the Krasnoyarsk Territory on lactating Holstein cows in their second lactation. Milk samples were collected from the cows once during morning milking. The qualitative composition of milk was studied in the milk quality selection control laboratory of JSC “Krasnoyarskagroplem”. Results. The research confirmed the influence of the “line” factor on the daily milk yield and individual milk quality parameters: the strength of the influence on the daily milk yield was 16.4%, on the protein mass fraction – 8.7 %, on SCC – 2.7 %. The “sire” factor reliably affected the protein mass fraction (4.3 %), while the combined effect of the factors affected the fat mass fraction and SCC (4.3 and 2.7 %). A statistically significant negative correlation was found between SCC and daily milk of the Jotan’s daughters (r = –0.613), and between SCC and protein content in the Aksel’s daughters (r=-0.582), Adamant’s daughters (r = –0.632), and Jotan’s daughters (r = –0.754). The somatic cell count in milk from cows born to sires belonging to two different lines ranged from 455.3 to 545.1 thousand cells per cubic centimeter, which generally did not exceed the requirements of GOST R52054-2023, while the milk was classified as grade 2.
Keywords: milk, mass fraction of fat, mass fraction of protein, somatic cells count, milk productivity, cow, sire, line
Acknowledgements. The study was carried out with the financial support of the Ministry of Science and Higher Education of the Russian Federation, state registration number of R&D 122031400484-7. The authors would like to thank the specialists of JSC “Arefyevskoe” for their assistance in conducting scientific research. For citation: Zaznobina T. V., Efimova L. V. The influence of hereditary factors on the milk productivity and somatic cells count in milk of Holstein cows. Agrarian Bulletin of the Urals. 2026; 26 (01): 108‒117. https://doi.org/10.32417/1997-4868-2026-26-01-108-117 (In Russ.)
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